List of free and open-source software packages

This is a list of free and open-source software (FOSS) packages, computer software licensed under free software licenses and open-source licenses. Software that fits the Free Software Definition may be more appropriately called free software; the GNU project in particular objects to their works being referred to as open-source.^[1] For more information about the philosophical background for open-source software, see free software movement and Open Source Initiative. However, nearly all software meeting the Free Software Definition also meets the Open Source Definition and vice versa. A small fraction of the software that meets either definition is listed here. Some of the open-source applications are also the basis of commercial products, shown in the List of commercial open-source applications and services.

• OpenClaw — agentic AI to handle tasks on your computer
• Auto-GPT — open-source autonomous goal-driven AI agent framework
• AgentGPT — browser-based autonomous AI agent platform

• OpenCog – project that aims to build an artificial general intelligence (AGI) framework. OpenCog Prime is a specific set of interacting components designed to give rise to human-equivalent artificial general intelligence.

• Apertus – Swiss National AI Initiative LLM^[2]
• BERT – Google LLM
• DeepSeek – R1 and V3 models^[3]
• Gemma 4 – Google LLM^[4]
• GLM-4.5 and later versions – Z.ai LLMs^[5]
• GPT-1, GPT-2, and GPT-OSS – OpenAI LLMs^[6]
• GPT-J – EleutherAI LLM
• Grok-1 – xAI LLM
• Kimi (some versions) – Moonshot AI LLMs
• Mistral (some versions)^[7]
• OLMo – Allen Institute for AI LLM
• Phi – Microsoft LLMs
• Qwen (some versions) – Alibaba Cloud LLMs^[8]
• Sarvam-M, Sarvam-105B and Sarvam-30B – Sarvam AI LLMs
• Step-3.5-Flash – StepFun LLM
• T5 – Google LLM
• XLNet – Google LLM

• AForge.NET – computer vision, artificial intelligence and robotics library for the .NET framework
• OpenCV – computer vision library in C++

• See List of open-source machine learning software
• See Data Mining below
• See R programming language – packages of statistical learning and analysis tools

• TREX – reactive planning

• ArduPilot
• CoppeliaSim
• Gazebo
• Mobile Robot Programming Toolkit
• OpenRTM-aist
• Paparazzi Project
• Player Project
• Python Robotics
• Robot Operating System (ROS)
• TurtleBot
• UBtech Thinker^[9]
• Webots – robot simulator

• CMU Sphinx – speech recognition software from Carnegie Mellon University
• Emacspeak – audio desktop
• ESpeak – compact software speech synthesizer for English and other languages
• Festival Speech Synthesis System – general multilingual speech synthesis
• Modular Audio Recognition Framework – voice, audio, speech NLP processing
• NonVisual Desktop Access (NVDA) – screen reader, for Windows
• Text2Speech – Text-To-Speech (TTS) Software

• Dasher – unique text input software
• Gnopernicus – AT suite for GNOME 2
• Virtual Magnifying Glass – multi-platform screen magnification tool

• Archimedes (CAD)
• Art of Illusion
• Blender
• BRL-CAD – constructive solid geometry (CSG) solid modeling computer-aided design (CAD) system
• FreeCAD – parametric 3D CAD modeler with a focus on mechanical engineering, BIM, and product design
• LeoCAD — beginner Lego 3D modeler
• LibreCAD – 2D CAD software using AutoCAD-like interface and file format
• MakeHuman
• MeshLab
• Open Cascade Technology (OCCT) – CAD kernel for 3D CAD, CAM, CAE
• OpenSCAD – scripting-based 3D CAD software
• QCAD
• SolveSpace – 2D and 3D CAD, constraint-based parametric modeler with simple mechanical simulation abilities
• Sweet Home 3D
• Wings 3D

• Advanced Simulation Library
• ASCEND
• DWSIM
• Elmer FEM solver
• Gmsh
• LibreCAD
• MapleSim
• Modelica
• OpenSim
• OpenFOAM
• Project Chrono
• Salome
• SimScale
• SU2 code
• xeokit

• LinuxCNC
• FreeCAD – Path Workbench

• Cura
• Slic3r
• MeshLab
• OctoPrint
• Marlin
• Klipper
• Repetier-Host
• AstroPrint

• tscircuit
• Electric
• FreePCB
• Fritzing – CAD software for the design of electronics hardware to build more permanent circuits from prototypes
• gEDA
• GNU Circuit Analysis Package (Gnucap)
• Icarus Verilog
• KiCad – suite for electronic design automation (EDA) for schematic capture, PCB layout, manufacturing file viewing, SPICE simulation, and engineering calculation
• KTechLab
• Magic
• Ngspice
• pcb-rnd
• Oregano
• Quite Universal Circuit Simulator (QUCS)
• Verilator
• XCircuit

• Blender – 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, and motion graphics
• FreeCad – equivalent of Blender, towards to mechanical engineering
• OpenFOAM – software used for computational fluid dynamics (or CFD)
• FlightGear - atmospheric and orbital flight simulator with a flight dynamics engine (JSBSim) that was used in a 2015 NASA benchmark^[10] to judge new simulation code to space industry standards
• SimPy – queue-theoretic event-based simulator written in Python
• Salome – generic platform for Pre- and Post-Processing for numerical simulation

• OpenPGP – open-source version of Pretty Good Privacy
• GNU Privacy Guard – replacement for PGP
• OpenSSL – library for applications that provide secure communications over computer networks
• NaCl (software) – crypto library
• Libsodium – fork of NaCl
• VeraCrypt – disk encryption software forked from TrueCrypt
• LUKS – standard for disk encryption on Linux systems
• Nym (mixnet) - mix network that uses noise and random packet timing for obfsucation, overlay network for NymVPN
• Tor (network) – free overlay network for enabling anonymous communication
• Tails (operating system) – security-focused Linux distro using Tor by default
• Signal (software) – secure messaging app
• Off-the-Record Messaging – protocol for secure instant messaging
• GPGTools – macOS suite for GnuPG-based encryption

• Aircrack-ng – Wi-Fi security auditing tool
• BackTrack – predecessor to Kali Linux
• Burp Suite Community Edition – security assessment and penetration testing of web applications
• Ghidra – software reverse engineering suite developed by the NSA
• Hashcat – password recovery utility
• High Orbit Ion Cannon - Ddos
• hping3 — packet crafting and network penetration-testing utility
• Hydra (software) – login cracker supporting numerous protocols
• John the Ripper – password cracking tool
• Kali Linux – penetration testing Linux distribution
• Metasploit Project – framework for developing and executing exploit code
• Netcat – network utility for reading/writing data across networks
• Nikto (vulnerability scanner) – web server vulnerability scanner
• Nmap – network scanning, port scanner, and auditing tool
• OpenSSH – implementation of the SSH protocol
• Radare2 – reverse engineering framework
• Snort (software) – network intrusion detection system
• sqlmap – automated SQL injection and database takeover tool
• Suricata (software) – network threat detection engine
• Volatility (memory forensics) – memory forensics framework for incident response
• Wireshark – network protocol analyzer
• YARA – tool to identify and classify malware

• Freenet – peer-to-peer platform for censorship-resistant communication
• Bitmessage – encrypted peer-to-peer messaging protocol
• I2P – anonymous network layer for secure communication
• Nym Technologies - privacy- and security-focused VPN service
• Tor (network) – free overlay network for enabling anonymous communication

• qBittorrent – BitTorrent client
• Transmission (BitTorrent client) – lightweight BitTorrent client
• IPFS – InterPlanetary File System for decentralized storage and sharing
• RetroShare – secure communication platform with file sharing

• Zerocoin – privacy-focused cryptocurrency protocol
• Zcash – cryptocurrency based on Zerocoin using zk-SNARKs
• Monero – privacy-focused cryptocurrency using ring signatures
• NYM) — Nym mixnet privacy- and security-focused token

• ClamAV – cross-platform antimalware toolkit written in C and C++, able to detect many types of malware including viruses
• ClamWin – antivirus tool for Windows and written in C, C++
• Lynis – security audit tool (set of shell scripts) for Unix and Linux

• MyDLP not updated since 2014

• dvdisaster
• ddrescue
• Foremost
• PhotoRec
• TestDisk

• The Coroner's Toolkit
• The Sleuth Kit

• USBKill
• Tails
• BusKill

• DBAN
• srm

• Bouncy Castle
• GnuPG
• GnuTLS
• KGPG
• NaCl
• OpenSSL
• Seahorse
• Signal
• stunnel
• TextSecure
• wolfCrypt
• 7-Zip

• dm-crypt
• FreeOTFE and FreeOTFE Explorer
• eCryptfs
• VeraCrypt

• Firewalld
• Uncomplicated Firewall (ufw)
• Firestarter
• IPFilter
• ipfw
• iptables
• nftables
• IPFire
• LEAF Project
• M0n0wall
• PeerGuardian
• PF
• pfSense
• OPNsense
• Rope
• Shorewall
• SmoothWall
• Vyatta
• VyOS

• Snort – network intrusion detection system (IDS) and intrusion prevention system (IPS)
• Suricata – network threat detection engine
• OpenVAS – software framework of several services and tools offering vulnerability scanning and vulnerability management
• Nmap – network scanner, port scanner, and security auditing tool
• Nikto – web server vulnerability scanner
• Volatility – memory forensics framework for incident response

• Cyberduck – macOS and Windows client (since version 4.0)
• Lsh – server and client, with support for SRP and Kerberos authentication
• OpenSSH – client and server
• PuTTY – client-only

• Bitwarden
• KeePass
• KeePassXC – multiplatform fork able to open KeePass databases
• Password Safe
• Mitro
• Pass
• Proton Pass

• BleachBit

• Apache Cassandra – NoSQL database from Apache Software Foundation offers support for clusters spanning multiple datacenter
• Apache CouchDB – NoSQL database from Apache Software Foundation with multi-master replication
• MariaDB – community-developed relational database management system with pluggable storage engines and commercial support
• PostGIS – adds support for geographic objects to the PostgreSQL as per Open Geospatial Consortium (OGC)
• PostgreSQL – relational database management system emphasizes on extensibility and SQL compliance and available for Windows, Linux, FreeBSD, and OpenBSD

• Environment for DeveLoping KDD-Applications Supported by Index-Structures (ELKI) – data mining software framework written in Java with a focus on clustering and outlier detection methods
• FrontlineSMS – information distribution and collecting via text messaging (SMS)
• Konstanz Information Miner (KNIME)
• OpenNN – neural network software library written in C++
• Orange (software) – data visualization and data mining for novice and experts, through visual programming or Python scripting. Extensions for bioinformatics and text mining
• RapidMiner – data mining software written in Java, fully integrating Weka, featuring 350+ operators for preprocessing, machine learning, visualization, etc. – the prior version is available as open-source
• Scriptella ETL – ETL (Extract-Transform-Load) and script execution tool. Supports integration with J2EE and Spring. Provides connectors to CSV, LDAP, XML, JDBC/ODBC, and other data sources
• Weka – data mining software written in Java featuring machine learning operators for classification, regression, and clustering
• JasperSoft – data mining with programmable abstraction layer

• ParaView – plotting and visualization functions developed by Sandia National Laboratory; capable of massively parallel flow visualization utilizing multiple computer processors
• VTK – toolkit for 3D computer graphics, image processing, and visualisation

• GParted
• FIPS (computer program)
• TestDisk

• ApexKB (formerly known as Jumper)
• Lucene
• Nutch
• Solr
• Xapian

• Konstanz Information Miner (KNIME)
• Pentaho

• PeaZip
• 7-Zip

• OpenAFS – distributed file system supporting a very wide variety of operating systems
• Tahoe-LAFS – distributed file system/Cloud storage system with integrated privacy and security features
• CephFS – distributed file system included in the Ceph storage platform

• Collabora Online Draw and Writer – edition of LibreOffice accessible from a web browser
• Scribus – designed for layout, typesetting, and preparation of files for professional-quality image-setting equipment. It can also create animated and interactive PDF presentations and forms
• LyX – "What You See Is What You Mean" document creation system, LyX makes use of the LaTeX markup macro system for TeX, allowing the elegant creation of documents which match up with the layouts in it for various document classes

• Calibre – cross-platform suite of ebook software
• Collabora Online Writer – edition of LibreOffice accessible from a web browser
• Sigil – editing software for e-books in the EPUB format

• ATutor – web-based Learning Content Management System (LCMS)
• Canvas LMS – web-based, open, extensible learning management system
• Chamilo – web-based e-learning and content management system
• Claroline – collaborative Learning Management System
• DoceboLMS – SAAS/cloud platform for learning
• eFront – icon-based learning management system
• H5P – framework for creating and sharing interactive HTML5 content
• IUP Portfolio – educational platform for Swedish schools
• ILIAS – web-based learning management system (LMS)
• Moodle – learning management system
• OLAT – web-based Learning Content Management System
• Omeka – content management system for online digital collections
• Sakai Project – web-based learning management system
• SWAD – web-based learning management system

• FlightPath – academic advising software for universities

• Tux Paint – painting application for 3–12 year olds
• GCompris – educational entertainment, aimed at children aged 2–10

• Alpheios Project
• Anki (software)
• FirstVoices
• Kiten

• Linux – Unix-based general use OS
• FreeBSD
• Fuchsia
• RedoxOS
• OpenBSD
• DragonFlyBSD
• NetBSD
• GNU/Hurd

• Vym (software)
• Compendium (software)
• Gnaural – brainwave entrainment software

• Kiwix – offline web browser that allows users download Wikipedia entire content and use for offline learning, later was expanded with repositories for Wikimedia Foundation, public domain texts from Project Gutenberg, many of the Stack Exchange sites, and other resources
• OpenStreetMap – OpenStreetMap was developed in 2004, it uses Open data and users data input through Crowdsourcing and Web mapping to create a complete and downloadable alternative to other online maps, this allow users to enter data when there is no data available due to lack of governance and economic interest or due lower population of the places mapped

• KTouch – touch typing lessons with a variety of keyboard layouts
• Tux Typing – typing tutor for children, featuring two games to improve typing speed

• Advanced Simulation Library
• ASCEND
• Calcpad
• Calculix
• CHEMKIN – chemical kinetics
• COCO simulator – chemical process simulator
• CP2K – quantum chemistry and solid-state physics
• DWSIM – chemical process simulator
• General Mission Analysis Tool (GMAT) – space mission analysis
• GNU Octave – numerical-analysis
• GROMACS – simulations of proteins, lipids, and nucleic acids
• JSBSim – flight dynamics engine
• LAMMPS – Molecular dynamics
• Open Babel – chemical informatics
• OpenModelica – chemical process simulator
• OpenSees – earthquake engineering
• OpenVSP – parametric aircraft geometry tool
• Pyomo – mathematical optimization
• QBlade – wind turbine design and aerodynamic simulation software
• REFPROP – reference Fluid Thermodynamic and Transport Properties
• XFOIL – analysis of subsonic isolated airfoils

• .apng – Animated Portable Network Graphics
• .avif – AV1 Image File Format
• .bpg – Better Portable Graphics
• .exr – OpenEXR
• .fits – Flexible Image Transport System primarily for Astronomy
• .flif – Free Lossless Image Format
• .gif – Graphics Interchange Format
• .iff / .lbm – InterLeaved BitMap
• .jng – JPEG Network Graphics
• .jpg or .jpeg – Joint Photographic Experts Group
• .jxl – JPEG XL
• .mng – Multiple-image Network Graphics
• .miff / .mi – Magick Image File Format
• .pam, .pbm, .pgm, .ppm, .pnm – Netpbm file formats
• .pgf – Progressive Graphics File
• .png – Portable Network Graphics
• .qoi – Quite OK Image Format
• .tiff – Tag Image File Format
• .wbmp – Wireless Application Protocol Bitmap Format
• .webp
• .xbm – X BitMap
• .xcf – GIMP
• .xpm – X PixMap

• .cgm – Computer Graphics Metafile
• .eps – Encapsulated PostScript
• .pdf – Portable Document Format
• .pgml – Precision Graphics Markup Language
• .svg – Scalable Vector Graphics
• .vml – Vector Markup Language, deprecated by SVG
• .xar – Xar (graphics)

• .3mf – 3D Manufacturing Format
• .amf – Additive manufacturing file format
• .blend – Blender
• .dae – COLLADA
• .dxf – Drawing Exchange Format, publicly documented format, developers can work with it in open-source projects, though not fully open-source itself.
• .fbx
• .gltf/.glb – Graphics Library Transmission Format
• .hdr – Radiance HDR
• .ifc – Industry Foundation Classes
• .iges – Initial Graphics Exchange Specification
• .obj – developed by Wavefront Technologies
• .off – Object File Format
• .ply – Polygon File Format
• .rad – Radiance
• .step/.stp
• .stl
• .usd – Universal Scene Description
• .vrml – Virtual Reality Modeling Language
• .x3d

• .mkv – Matroska
• .ogv – Theora
• .vp8
• .vp9
• .webm

• .aiff – Audio Interchange File Format
• .flac – Free Lossless Audio Codec
• .ogg
• .opus
• .wav

• .adoc – AsciiDoc
• .epub – ebook format
• .latex – LaTeX, macro package built on top of TeX for simplification
• .md – Markdown
• .odt – OpenDocument
• .rtf – Rich Text Format
• .tex – high-quality typography for mathematical notation, physics, chemistry, engineering/scientific notation
• .texinfo

• .css – Cascading Style Sheets
• .html – HyperText Markup Language
• .json – GeoJSON, JSON-LD, JSON-RPC, JsonML, Smile, UBJSON
• .mml – MathML

• .avro – Apache Avro
• .cml – Chemical Markup Language
• .csv – Comma-separated values
• .hdf5 – Hierarchical Data Format
• .ods – OpenDocument Spreadsheet
• .orc – Apache ORC
• .parquet – Apache Parquet
• .protobuf – Protocol Buffers developed by Google
• .shp – Shapefile
• .sqlite – SQLite
• .tsv – Tab-separated values
• .xml – Extensible Markup Language

• 1DayLater – invoicing software
• GnuCash – double-entry book-keeping
• HomeBank – personal accounting software
• KMyMoney – double-entry book-keeping
• LedgerSMB – double-entry book-keeping
• RCA open-source application – management accounting application
• SQL-Ledger – double-entry book-keeping
• TurboCASH – double-entry book-keeping for Windows

• Bitcoin – blockchain platform, peer-to-peer decentralised digital currency
• Ethereum – blockchain platform with smart contract functionality

• CiviCRM – Constituent Relationship Management software aimed at charities and NGOs
• iDempiere – business Suite, ERP and CRM
• SuiteCRM – web-based CRM

• Adempiere – Enterprise resource planning (ERP) business suite
• Apache OFBiz – suite of enterprise applications from Apache Software Foundation
• Compiere – ERP solution automates accounting, supply chain, inventory, and sales orders
• Dolibarr – web-based ERP system
• ERPNext – web-based ERP system for managing accounting and finance
• ERP5 – Single Unified Business Model based system written with Python and Zope
• iDempiere – fully navigable on PCs, tablets and smartphones driven only by a community of supporters
• JFire – ERP business suite written with Java and JDO
• LedgerSMB – double entry accounting and ERP system written with Perl
• metasfresh – ERP Software
• Odoo – ERP, CRM and CMS
• Openbravo – web-based ERP
• Tryton – ERP

• OrangeHRM – commercial human resource management

• Mifos – microfinance Institution management software

• Bonita Open Solution – Business Process Management

• ARB assembly language
• Cg
• OpenGL Shading Language
• Open Shading Language
• Standard Portable Intermediate Representation

• Nexuiz – first-person shooter
• OpenArena – first-person shooter
• Red Eclipse – first-person shooter
• Tremulous – first-person shooter
• Unvanquished – First-person shooter
• Xonotic – first-person shooter that runs on a heavily modified version of the Quake engine known as the DarkPlaces engine
• Warsow – first-person shooter fast-paced arena FPS game that runs on the Qfusion engine

• WINE – allows Windows applications to be run on Unix-like operating systems

• ChessV
• Fairy-Max
• GNU Chess
• PyChess
• XBoard
• Lichess

• GCompris – software suite comprising educational entertainment software for children aged 2 to 10
• Tux, of Math Command
• Tux Paint

• MAME – multi-platform emulator for arcade game systems
• Mednafen – multi-platform emulator
• MESS – multi-platform emulator
• RetroArch – cross-platform front-end for emulators, game engines and video games
• Snes9x – Super Nintendo emulator
• Stella – Atari 2600 emulator
• PCSX – PlayStation emulator
• PCSX2 – PlayStation 2 emulator
• PPSSPP – PlayStation Portable emulator
• Project64 – Nintendo 64 emulator
• RetroArch – emulator and media player frontend
• RPCS3 – PlayStation 3 emulator
• Dolphin (emulator) – GameCube and Wii emulator
• Citra (emulator) – Nintendo 3DS and Wii emulator
• Cemu – Wii U emulator
• TIC-80 – virtual machine game engine that mimics the 8-bit systems of the 1980s

• Frets on Fire

• UltraStar

• StepMania

• Pingus – Lemmings alternative with penguins instead of lemmings

• Luanti – voxel game engine

• GLtron

• Endless Sky – space trading and combat simulation
• FlightGear – flight simulator
• OpenTTD – business simulation game in which players try to earn money via transporting passengers and freight by road, rail, water and air
• SuperTuxKart – kart racing game that features mascots of various open-source projects

• 0 A.D. – real-time strategy video game
• Freeciv – turn-based strategy game inspired by proprietary Sid Meier's Civilization series
• Glest
• The Battle for Wesnoth – turn-based strategy video game with fantasy setting

• Gramps (software) – genealogy software

• QGIS – cross-platform desktop geographic information system (GIS) application to view, edit, and analyse geospatial data

• Evergreen – integrated Library System initially developed for the Georgia Public Library Service's PINES catalog
• FOLIO - Modular, open-source library services platform
• Koha – SQL-based library management
• NewGenLib
• OpenBiblio
• PMB
• refbase – web-based institutional repository and reference management software

• Darktable – digital image workflow management, including RAW photo processing
• digiKam – integrated photography toolkit including editing abilities
• GIMP – raster graphics editor aimed at image retouching/editing
• Hugin – panorama stitching
• Inkscape – vector graphics editor
• Karbon – scalable vector drawing application in KDE
• Krita – digital painting, sketching and 2D animation application, with a variety of brush engines
• LazPaint – raster and vector graphics editor, aimed at being simpler to use than GIMP
• LightZone – digital photo editor software application
• Luminance HDR – high dynamic range images
• RawTherapee – digital image workflow management aimed at RAW photo processing

• OpenStreetMap – open geographic database updated and maintained by a community of volunteers via open collaboration
• OsmAnd – freemium maps & navigation Android and iOS app
• Organic Maps – offline map and navigation app for Android & iOS
• CoMaps (Android, iOS)

• Calcpad
• GeoGebra
• GNOME Calculator
• GraphCalc
• KCalc
• Qalculate!
• WRPN Calculator
• xcalc

• Meep
• Elmer FEM solver
• Numerical Electromagnetics Code

• Astropy
• CMBFAST
• GADGET

• CP2K
• EGS
• MCSim
• McStas
• McXtrace
• MPMC
• OpenMC
• TARDIS

• FORM (symbolic manipulation system)

• ADMB
• Euler Math Toolbox
• FreeMat
• GNU Data Language
• GNU MCSim
• GNU Octave
• J
• Julia
• Owl Scientific Computing
• Perl Data Language
• S-Lang
• Scilab
• Yorick

• Geogebra – geometry and algebra
• C.a.R.
• CaRMetal
• DrGeo
• Kig
• KSEG

• Chart.js
• D3.js
• ggplot2
• Graphics Layout Engine
• Gnuplot
• Grace
• Matplotlib
• Plotly
• PLplot
• PyX
• ROOT
• SciDAVis
• Vega

• JFreeChart
• Matplotlib
• R

• COPASI
• Systems Biology Simulation Core Library
• Virtual Cell

• Cantera
• CP2K
• MOPAC
• NWChem
• Psi4

• Collabora Online Calc – spreadsheet component of the Collabora Online package
• LibreOffice Calc – spreadsheet component of the LibreOffice package
• OnlyOffice Spreadsheets – spreadsheet software of OnlyOffice suite
• Gnumeric – spreadsheet program of the GNOME Project
• Calligra Sheets – spreadsheet component of the Calligra Suite in KDE
• Proton Sheets - spreadsheet component of office suite and Drive
• Pyspread – spreadsheet which uses Python for macro programming, and allows each cell to contain data, the results of a calculation, a Python program, or the results of a Python program

• Celestia (Android, iOS)
• Calligra (Android)
• Collabora Office (Android, ChromeOS, iOS, iPadOS)
• CoMaps (Android, iOS)
• Conversations (Android)
• F-Droid (Android) – app store and software repository
• I2P (Android) – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication
• Kiwix – offline web browser that allows users to download the entire content of Wikipedia for offline learning purposes. (Android)
• Krita (Android)
• Linphone (Android, iOS)
• Monal (iOS)
• NetHunter App Store (Android) – fork of F-Droid for Kali NetHunter
• OsmAnd – freemium maps & navigation Android and iOS app
• OpenVPN (Android, iOS) – virtual private network (VPN) system that implements techniques to create secure point-to-point or site-to-site connections in routed or bridged configurations and remote access facilities. It implements both client and server applications
• Orbot (Android, iOS) – free proxy app that provides anonymity on the Internet for users of the Android and iOS operating systems. It allows traffic from apps such as web browsers, email clients, map programs, and others to be routed via the Tor network
• Organic Maps – offline map and navigation app for Android & iOS
• Quicksy (Android)
• Tor Browser – onion-routed browser by The Tor Project, based on Firefox ESR
• VLC (Android, iOS)
• Wikipedia (Android, iOS) – See also: List of Wikipedia mobile applications

• Audacity
• Ardour – professional digital audio workstation
• LMMS – digital audio workstation

• Brasero (software)
• cdrtools
• K3b
• X-CD-Roast

• Pencil2D – for animations
• SWFTools – for scripting

• Blender Game Engine – discontinued 2019
• Godot – application for the design of cross-platform video games
• MonoGame – C# framework
• Open3DEngine – based on Amazon Lumberyard
• Stride – (prev. Xenko) 2D and 3D cross-platform game engine originally developed by Silicon Studio

• KnightCap
• Leela Chess Zero – Universal Chess Interface chess engine
• Stockfish – Universal Chess Interface chess engine

• Pencil2D – simple 2D graphics and animation program
• Synfig – 2D vector graphics and timeline based animation
• TupiTube (formerly KTooN) – application for the design and creation of animation
• OpenToonz – part of a family of 2D animation software
• Krita – digital painting, sketching and 2D animation application, with a variety of brush engines
• Blender – computer graphics software, Blender's Grease Pencil tools allow for 2D animation within a full 3D pipeline
• mtPaint – raster graphics editor for creating icons, pixel art

• Blender – computer graphics software featuring modeling, sculpting, texturing, rigging, simulation, rendering, camera tracking, video editing, and compositing
• FreeCAD
• MakeHuman
• OpenFX – modeling and animation software with a variety of built-in post processing effects
• Picogen – terrain generator
• Seamless3d – node-driven 3D modeling software
• Wings 3D – subdivision modeler inspired by Nendo and Mirai from Izware

• Aqsis
• Cycles and EEVEE – Blender rendering
• LuxCoreRender
• MoonRay
• POV-Ray
• Radiance (software)
• Sunflow

• Shotwell
• Wikimedia Commons

• Eye of GNOME
• F-spot
• feh
• Geeqie
• Gthumb
• Gwenview
• KPhotoAlbum
• Opticks

• Aegisub
• Gnome Subtitles
• Subtitle Edit

• Dr. DivX
• FFmpeg
• MEncoder
• OggConvert

• Avidemux
• AviSynth
• Blender
• Cinelerra
• Flowblade
• Kdenlive
• Kino
• LiVES
• LosslessCut
• Natron
• Olive
• OpenShot
• Open Movie Editor
• Pitivi
• Shotcut
• VirtualDub
• VideoLAN Movie Creator

• DeVeDe
• DVD Flick
• DVDStyler

• recordMyDesktop
• Open Broadcaster Software (OBS Studio) – cross-platform streaming and recording program

• Celtx – media pre-production software

• K9Copy
• Thoggen

• Avidemux
• HandBrake
• FFmpeg
• OggConvert

• Media Player Classic
• VLC media player
• mpv

• Revive Adserver

• Asterisk – telephony and VoIP server
• Ekiga – video conferencing application for GNOME and Microsoft Windows
• ConferenceXP – video conferencing application for Windows XP or later
• Dino – xmpp client, supporting both OMEMO encryption and Jingle Audio/Video protocol, under Windows, Linux and BSD
• FreePBX – front-end and advanced PBX configuration for Asterisk
• FreeSWITCH – telephony platform
• Gajim – xmpp client
• Jami – cross-platform, peer to peer instant-messaging and video-calling protocol that offers end-to-end encryption and SIP client
• Jitsi – Java VoIP and Instant Messaging client
• QuteCom – voice, video, and IM client application
• Enterprise Communications System sipXecs – SIP Communications Server
• Telegram
• Twinkle – VoIP softphone
• Tox – cross-platform, peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption

• Amavis – email content filter
• Claws Mail – email Client
• Fetchmail – email Retrieval
• Geary – email client based on WebKitGTK+
• GNUMail – cross-platform email client
• Hula – discontinued mail and calendar project
• K-9 Mail – Android Email Client
• MailScanner – email security system
• MH Message Handling System – email Client
• Modest – email Client
• Mozilla Mail & Newsgroups – email Client that was part of the now discontinued Mozilla Application Suite
• Mozilla Thunderbird – email, news, RSS, and chat client
• POPFile – cross-platform mail filter
• Proton Mail - app and web-based end-to-end encrypted e-mail evolved to become FOSS
• Roundcube – web-based IMAP email client
• Sylpheed – email and News Client
• Sympa – MLA software

• Filezilla
• OnionShare

• GNU Queue
• HTCondor
• pexec

• Apache Axis2 – Web service framework (implementations are available in both Java & C)
• Apache Geronimo – application server
• Bonita Open Solution – J2EE web application and java BPMN2 compliant engine
• GlassFish – application server
• Apache Tomcat – servlet container and standalone webserver
• JBoss – application server
• OpenRemote – IoT Middleware
• TAO (software) – C++ implementation of the OMG's CORBA standard

• Akregator – platforms running KDE
• Liferea – platforms running GNOME
• NetNewsWire – macOS, iOS
• RSS Bandit – Windows, using .NET framework
• RSSOwl – Windows, macOS, Solaris, Linux using Java SWT Eclipse

• Bluesky - microblogging platform similar to Twitter utilizing the AT Protocol
• Mastodon - platform for decentralized social networking with microblogging features
• Nostr - open protocol for decentralized message transmission, with the intention to be able to resist internet censorship^[11] while maintaining session integrity.

• I2P – anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication
• OnionShare – file sharing app using Tor network
• Popcorn Time – multi-platform media player
• qBittorrent – BitTorrent client
• Transmission – BitTorrent client
• Deluge – BitTorrent client

• Drupal
• Liferay
• Sun Java System Portal Server
• uPortal

• FreeNX
• OpenVPN
• rdesktop
• Synergy
• VNC (RealVNC, TightVNC, UltraVNC)
• Remmina (based on FreeRDP)
• RustDesk

• Chromium – web browser using the custom Blink engine from which Google Chrome draws its source code
• Brave – privacy-focused web browser based on Chromium browser
• Falkon – web browser based on Blink engine, a KDE project
• Firefox – Mozilla-developed web browser using Gecko layout engine
• Mullvad Browser - privacy-focused browser codeveloped with primary developer Tor Project and distributed by Mullvad
• Waterfox – Firefox fork supporting legacy extensions, 64-bit only
• Pale Moon – customizable fork of Firefox
• Tor Browser – onion-routed browser by The Tor Project, based on Firefox ESR
• GNOME Web – WebKit-based web browser for the GNOME desktop environment
• Midori – web browser using the WebKit layout engine
• qutebrowser – keyboard operated Webkit-based browser with vi-like keybindings
• SeaMonkey Navigator – the SeaMonkey internet suite's web browser
• Surf – minimal tab-less browser by suckless.org using WebKitGTK
• Firefox Focus – privacy-focused mobile web browser from Mozilla available for Android and iOS

• Lynx – text-based web browser developed since 1992
• Links – text-based browser with a framebuffer-based graphical mode
• ELinks – fork of Links with JavaScript support

• Cheese – GNOME webcam application
• Guvcview – Linux webcam application

• cURL
• HTTrack
• Wget

• Apache Cocoon – web application framework
• Apache Tomcat
• Apache – web server
• AWStats – log file parser and analyzer
• BookmarkSync – tool for browsers
• Caddy – extensible, cross-platform, web server written in Go.
• Cherokee – HTTP server
• curl-loader – HTTP/HTTPS/FTP/FTPS loading and testing tool
• Docker – Docker Engine is open-source for Linux only
• FileZilla – FTP
• H2O – supports HTTP/2, TLS, and server push
• Hiawatha – HTTP server
• HTTP File Server – file server software, with a drag-and-drop interface
• lighttpd – HTTP Server
• Lucee – CFML application server
• Nginx – web server/reverse proxy and e-mail (IMAP/POP3) proxy
• NetKernel – Internet application server
• Qcodo – PHP5 framework
• Squid – web proxy cache
• thttpd – designed for simplicity, small memory footprint, and speed
• Vaadin – Java-based framework for creating web applications
• Varnish – web application accelerator/reverse proxy and load balancer/HTTP router
• XAMPP – package of web applications including Apache and MariaDB
• Zope – web application server

• SearXNG – self-hostable metasearch engine
• YaCy – P2P-based search engine

• JXplorer – LDAP client
• Nextcloud – fork of ownCloud
• OpenLDAP – LDAP server
• ownCloud – file share and sync server
• Wireshark – network monitor

Software	Platform
AbiWord	Linux, Windows
Atom (text editor)	macOS 10.9 or later, Windows 7 and later, and Linux
gedit	Linux, MacOS
GNOME Text Editor	Linux
Kate (text editor)	25 Linux distributions, Microsoft Windows, macOS
Leafpad	Linux, BSD, Maemo
Metapad	Windows
Mousepad	Linux, BSD, Maemo
Notepad++	Windows
Proton Doc	Linux, macOS, Windows, Android, iOS
Visual Studio Code	Linux, Windows, macOS

Software	Operating system	Format
Gnumeric	Unix-like (Linux included)	.gnm, .gnumeric
GNU Oleo	Linux	.oleo[12]
Pyspread	Unix-like, Windows	.CSV, .XLS, .SVG, .PDF
Sheetster	Cross-platform	JSON, XML, .XLS, .CSV, xlsx/.ooxml, .exml, .zip

• Apache OpenOffice – the cross platform office productivity suite from Apache Software Foundation (ASF) consists of programs for word processing, spreadsheets, presentation, diagrams and drawings, databases, etc.
• Calligra Suite – the office productivity suite from KDE consists of programs for word processing, spreadsheets, presentation, databases, vector graphics, and digital painting
• Collabora Online – edition of LibreOffice, web application, mobile phone, tablet, Chromebook and desktop (Windows, macOS, Linux)^[13]
• LibreOffice – the cross platform office productivity suite from The Document Foundation (TDF) consists of programs for word processing, spreadsheets, presentation, diagrams and drawings, databases, etc.
• OnlyOffice Desktop Editors – offline edition of the Cloud

• PDFsam Basic edition – platform independent software designed to split, merge, mix, extract pages and rotate PDF files for Windows, Linux, MacOS. Open-source version of their commercial offering

Be advised that available distributions of these systems can contain, or offer to build and install, added software that is neither free software nor open-source.

• BSD – FreeBSD, OpenBSD, NetBSD, GhostBSD, TrueNAS, MidnightBSD, DragonFly BSD, OPNsense, pfSense, XigmaNAS, among others.
• GrapheneOS
• Kali NetHunter
• Linux – Debian, Ubuntu, Manjaro, Fedora, openSUSE, antiX, NixOS, Kali, Alpine, Tails, Mageia, Slackware, Gentoo, BlackArch, among others (List of Linux distributions).
• LineageOS – android-based operative system for tablets and mobile phones
• GNU Hurd
• Mobian
• Plasma Mobile
• PostmarketOS
• PureOS
• Ubuntu Touch
• Redox OS
• FreeDOS – OS compatible with IBM PC DOS and Microsoft's MS-DOS
• ReactOS – OS intended to run the same software as Windows, originally designed to simulate Windows NT 4.0, later aiming at Windows 7 compatibility. It has been in the development stage since 1996.

• AppleWin
• DOSBox – DOS programs emulator (including PC games)
• GNOME Boxes
• Hercules (emulator)
• Kernel-based Virtual Machine
• QEMU
• VirtualBox – hosted hypervisor for x86 virtualization

• Chandler – developed by the Open Source Applications Foundation (OSAF)
• KAddressBook
• Kontact
• KOrganizer
• Mozilla Calendar – Mozilla-based, multi-platform calendar program
• GNOME Evolution
• Perkeep – personal data store for pictures
• Project.net – commercial project management
• TeamLab – platform for project management and collaboration

• Bugzilla
• Mantis
• Mindquarry
• Redmine
• Trac

• Babel – JavaScript transcompiler
• Bison
• CodeSynthesis XSD – XML Data Binding compiler for C++
• CodeSynthesis XSD/e – validating XML parser/serializer and C++ XML Data Binding generator for mobile and embedded systems
• Flex lexical analyser – generates lexical analyzers
• Open Scene Graph – 3D graphics application programming interface
• OpenSCDP – Open Smart Card Development Platform
• SableCC – parser generator for Java and .NET
• SWIG – Simplified Wrapper and Interface Generator for several languages
• xmlbeansxx – XML Data Binding code generator for C++
• YAKINDU Statechart Tools – Statechart code generator for C++ and Java

• Doxygen – tool for writing software reference documentation. The documentation is written within code
• Mkd – extracts software documentation from source code files, pseudocode, or comments
• Natural Docs

• Autoconf
• Automake
• CMake

• GNU Debugger – portable debugger that runs on many Unix-like systems
• Memtest86 – stress-tests RAM on x86 machines
• Xnee – record and replay tests

• Active Agenda – operational risk management and rapid application development platform

• Biopython
• BioPerl
• BioRuby
• BioJava

• COPASI
• Systems Biology Simulation Core Library
• Virtual Cell
• CellProfiler
• ImageJ

• PyMOL
• Jmol
• AlphaFold

• BEAST 2
• MrBayes

• Advanced Simulation Library
• BALL
• Biskit
• Car–Parrinello molecular dynamics
• GROMACS
• LAMMPS
• NAMD
• Newton-X
• OpenAtom
• OpenMM
• RMG

• Avogadro
• Biskit
• Chemistry Development Kit
• Gabedit
• Ghemical
• JOELib
• Open Babel
• RDKit
• SHELX

• Cantera
• CASINO
• CONQUEST
• DP code
• EXC code
• FDMNES
• Internal Coordinate Mechanics
• OctaDist
• Spinach

• Apache Flink – stream and batch data processing framework
• Apache Hadoop – distributed storage and processing framework
• Apache Mahout – scalable machine learning library
• Apache Spark – unified analytics engine
• Dask – parallel computing for analytics in Python
• ELKI – data analysis algorithms library
• GNU Octave – numerical computing environment
• JASP – GUI program for data analytics, data science, and machine learning
• Jupyter Notebook – interactive computing
• Keras – neural network library
• KNIME – data analytics platform
• Matplotlib – data visualization library
• MLlib – machine learning library for Apache Spark
• NumPy – numerical computing library
• Orange – data mining tool
• pandas – data manipulation library
• PyTorch – machine learning and deep learning framework
• Python
• R – statistical computing language
• SageMath – mathematics and data analysis environment
• SciPy – scientific computing library
• scikit-learn – Python machine learning library
• TensorFlow – machine learning framework
• WEKA – machine learning and data analysis suite

• Jupyter

• CellProfiler – automatic microscopic analysis, aimed at individuals lacking training in computer vision
• Endrov – Java-based plugin architecture designed to analyse complex spatio-temporal image data
• Fiji – imageJ-based image processing
• Gwyddion – scanning probe microscopy data visualization and processing
• Ilastik – image-classification and segmentation software
• ImageJ – image processing application developed at the National Institutes of Health
• IMOD – 2D and 3D analysis of electron microscopy data
• ITK – development framework used for creation of image segmentation and registration programs
• KNIME – data analytics, reporting, and integration platform
• VTK – C++ toolkit for 3D computer graphics, image processing, and visualisation
• 3DSlicer – medical image analysis and visualisation

• Ascalaph Designer
• Winmostar

• GROMACS – protein, lipid, and nucleic acid simulation
• LAMMPS – molecular dynamics software
• MDynaMix – general-purpose molecular dynamics, simulating mixtures of molecules
• ms2 – molecular dynamics and Monte Carlo simulation package to predict thermophysical properties of fluids
• NWChem – wuantum chemical and molecular dynamics software

• Ascalaph Designer
• Avogadro
• Gabedit
• JChemPaint
• Kekulé Program
• XDrawChem

• Avogadro
• BALL
• Gabedit
• Jmol
• Molekel
• PyMOL
• RasMol

• Avogadro
• CP2K
• GROMACS
• LAMMPS
• MDynaMix
• ms2
• OpenMM
• Orac
• NWChem
• Q
• Quantum ESPRESSO

• Chemfig
• JChemPaint
• XDrawChem
• XyMTeX

• Avogadro – plugin-extensible molecule visualisation
• BALLView – molecular modeling and visualisation
• Jmol – 3D representation of molecules in many formats, for teaching use
• Molekel – molecule viewing software
• MeshLab – able to import PDB dataset and build up surfaces from them
• PyMOL – high-quality representations of small molecules and biological macromolecules
• QuteMol – interactive molecule representations offering an array of innovative OpenGL visual effects
• RasMol – visualizes biological macromolecules

• nanoHUB
• Ninithi – visualise and analyse carbon allotropes, such as carbon nanotube, Fullerene, graphene nanoribbons

• OpenMC

• Veusz

• CP2K – atomistic and molecular simulation of solid-state, liquid, molecular, and biological systems

• BOINC
• Electric Sheep
• XScreenSaver

• List of free and open source simulation software

• R – statistics software
• LimeSurvey – online survey system

• Go Bible – free Bible viewer application for Java mobile phones
• Marcion – Coptic–English/Czech dictionary
• OpenLP – worship presentation program licensed under the GNU General Public License
• The SWORD Project – CrossWire Bible Society's free software project

• Jitsi Meet
• OpenMeetings
• Conference XP
• Jami
• BigBlueButton

• Open-source software
• Open-source license
• Comparison of file synchronization software § Open-source
• List of HDL simulators § Free and open-source simulators
• List of optimization software § Free and open-source software
• List of concept- and mind-mapping software § Free and open-source
• List of spreadsheet software § Free and open-source software
• Comparison of FTP client software § Free and open-source software
• GNOME Core Applications
• List of GNU packages
• List of KDE applications
• List of formerly proprietary software
• List of Unix commands
• List of open-source hardware projects
• List of public domain projects

• AlternativeTo
• CodePlex
• Free Software Directory
• Freecode
• Open Hub
• SourceForge

• Open Source Software Directory (OSSD), a set of FOSS organized by target audience
• List of open-source programs (LOOP) for Windows, maintained by the Ubuntu Documentation Project
• The OSSwin Project, a list of free and open-source software for Windows
• Apache Project List
• Apache Projects Directory
• Software – GNU Project – Free Software Foundation
• Free Software Directory