List of free and open-source software packages

Artificial intelligence

General

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

  Computer Vision

• AForge.NET – Computer Vision, Artificial Intelligence and Robotics library for the.NET Framework
• OpenCV – Computer Vision Library in C++

  Machine Learning

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

  Planning

• TREX – Reactive planning

  Robotics

• ROS – Robot Operating System
• YARP – Yet Another Robot Platform

  Assistive technology

Speech (synthesis and recognition)

• 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 – Screen reader, for Windows
• Text2Speech – Lightweight, easy-to-use Text-To-Speech Software

  Other assistive technology

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

  CAD

• FreeCAD – Parametric 3D CAD modeler with a focus on mechanical engineering, BIM, and product design
• LibreCAD – 2D CAD software using AutoCAD-like interface and file format

  Electronic design automation (EDA)

• Fritzing
• KiCad

  Computer simulation

• Blender – 3D computer graphics software toolset used for creating animated films, visual effects, art, 3D printed models, motion graphics, interactive 3D applications, and computer games.
• FlightGear – Multi-platform flight simulator
• SimPy – Queue-theoretic event-based simulator written in Python

  Cybersecurity

Antivirus

• ClamAV
• ClamWin
• Gateway Anti-Virus
• Lynis

  Data loss prevention

• MyDLP

  Data recovery

• dvdisaster
• Foremost
• PhotoRec
• TestDisk

  Forensics

• The Coroner's Toolkit
• The Sleuth Kit

  Anti-forensics

• USBKill

  Disk erasing

• DBAN
• srm

  Encryption

• AES
• GnuPG
• GnuTLS
• KGPG
• NaCl
• OpenSSL
• Seahorse
• Signal
• stunnel
• TextSecure
• wolfCrypt

  Disk encryption

• CrossCrypt
• FreeOTFE and FreeOTFE Explorer
• eCryptfs

  Firewall

• Firestarter
• IPFilter
• ipfw
• iptables
• M0n0wall
• PeerGuardian
• PF
• pfSense
• Rope
• Shorewall
• SmoothWall
• Vyatta

  Network and security monitoring

• Snort – Network intrusion detection system and intrusion prevention system
• OpenVAS – software framework of several services and tools offering vulnerability scanning and vulnerability management

  Secure Shell (SSH)

• Cyberduck – macOS and Windows client
• Lsh – Server and client, with support for SRP and Kerberos authentication
• OpenSSH – Client and server
• PuTTY – Client-only

  Password management

• Bitwarden
• KeePass
• Password Safe
• Mitro

  Other cybersecurity programs

Data storage and management

Backup software

Database management systems (including administration)

Data mining

• Environment for DeveLoping KDD-Applications Supported by Index-Structures – Data mining software framework written in Java with a focus on clustering and outlier detection methods
• FrontlineSMS – Information distribution and collecting via text messaging
• Konstanz Information Miner
• OpenNN – Open-source neural networks software library written in the C++ programming language
• Orange – 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 previous version is available as open-source
• Scriptella ETL – ETL 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

  Data Visualization Components

• 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.

  Digital Asset Management software system

Disk partitioning software

Enterprise search engines

• ApexKB, formerly known as Jumper
• Lucene
• Nutch
• Solr
• Xapian
• Elasticsearch

  ETLs (Extract Transform Load)

• Konstanz Information Miner
• Pentaho

  File archivers

File systems

• 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.

  Desktop publishing

• 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.

  E-book management and editing

• Calibre – Cross-platform suite of e-book software
• Sigil – Editing software for e-books in the EPUB format

  Educational

Educational suites

• ATutor – Web-based Learning Content 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
• FlightPath – Academic advising software for universities
• GCompris – Educational entertainment, aimed at children aged 2–10
• Gnaural – Brainwave entrainment software
• H5P – Framework for creating and sharing interactive HTML5 content
• IUP Portfolio – Educational platform for Swedish schools
• ILIAS – Web-based learning management system
• Moodle – Free and open-source learning management system
• OLAT – Web-based Learning Content Management System
• Omeka – Content management system for online digital collections
• openSIS – Web-based Student Information and School Management system
• Sakai Project – Web-based learning management system
• SWAD – Web-based learning management system
• Tux Paint – Painting application for 3–12 year olds
• UberStudent – Linux based operating system and software suite for academic studies

  Geography

• KGeography – Educational game teaching geography

  Learning support

Language

• Kiten

  Typing

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

  File managers

Finance

Accounting

• 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
• Wave Accounting – Double-entry book-keeping

  Cryptocurrency

• EOS.IO – Blockchain platform, peer-to-peer decentralised digital currency

  CRM

• CiviCRM – Constituent Relationship Management software aimed at NGOs
• iDempiere – Business Suite, ERP and CRM
• SugarCRM – Commercial Customer Relationship Management

  ERP

• Adempiere – Enterprise resource planning business suite
• Compiere – ERP solution automates accounting, supply chain, inventory, and sales orders
• Dolibarr – Web-based ERP system
• ERPNext – Web-based open-source ERP system for managing accounting and finance
• Ino erp – Dynamic pull based system ERP
• JFire – An ERP business suite written with Java and JDO
• metasfresh – ERP Software
• Odoo – Open-source ERP, CRM and CMS
• Openbravo - Web-based ERP
• Tryton - Open-source ERP

  Human resources

• OrangeHRM – Commercial human resource management

  Microfinance

• Cyclos – Software for microfinance institutions, complementary currency systems and timebanks
• Mifos – Microfinance Institution management software

  Process management

• Bonita Open Solution – Business Process Management

  Trading

• jFin – Java-based trade-processing program
• QuickFIX – FIX protocol engine written in C++ with additional C#, Ruby, and Python wrappers
• QuickFIX/J – FIX protocol engine written in Java

  Games

Action

• 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

  Application layer

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

  Emulation

• MAME – Multi-platform emulator designed to recreate the hardware of arcade game systems
• RetroArch – Cross-platform front-end for emulators, game engines and video games

  Puzzle

• Pingus – Lemmings clone with penguins instead of lemmings

  Simulation

• 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.

  Strategy

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

  Genealogy

• Gramps - a free and open source genealogy software.

  Geographic information systems

• QGIS - cross-platform desktop geographic information system application that supports viewing, editing, and analysis of geospatial data.

  Graphical user interface

Desktop environments

Window managers

Windowing system

Groupware

Content management systems

Wiki software

Healthcare software

Hobby software

Homebrewing

• CyberBrau

  Integrated Library Management Software

• Evergreen – Integrated Library System initially developed for the Georgia Public Library Service's PINES catalog
• Koha – SQL-based library management
• NewGenLib
• OpenBiblio
• PMB
• refbase – Web-based institutional repository and reference management software

  Image editor

• Darktable – Digital image workflow management, including RAW photo processing
• digiKam – Integrated photography toolkit including editing capabilities
• GIMP – Raster graphics editor aimed at image retouching/editing
• Inkscape – Vector graphics editor
• Karbon – Scalable vector drawing application in KDE
• Krita – Digital painting and sketching application, with a variety of brush engines
• LightZone - Free, open-source digital photo editor software application.
• RawTherapee – Digital image workflow management aimed at RAW photo processing

  Mathematics

Media

2D animation

• Pencil2D – Simple 2D graphics and animation program
• Pivot Animator – Application used to create stick figure and sprite animations
• Synfig – 2D vector graphics and timeline based animation
• TupiTube – Application for the design and creation of animation
• OpenToonz – Part of a family of 2D animation software

  3D animation

• Blender – Professional computer graphics software featuring modeling, sculpting, texturing, rigging, simulation, rendering, camera tracking, video editing, and compositing
• OpenFX – Modeling and animation software with a variety of built-in post processing effects
• Seamless3d – Node-driven 3D modeling software

  Audio editors, audio management

CD/USB-writing software

Flash animation

• Pencil2D – For animations
• SWFTools – For scripting

  Game Engines

• Godot – Application for the design of cross-platform videogames
• Stockfish – Universal Chess Interface chess engine

  Graphics

Image galleries

Image viewers

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

  Multimedia codecs, containers, splitters

Television

Video converters

• Dr. DivX
• FFmpeg
• MEncoder
• OggConvert

  Video editing

• Avidemux
• AviSynth
• Blender
• Cinelerra
• DScaler
• DVD Flick
• Flowblade
• Kaltura
• Kdenlive
• Kino
• LiVES
• Natron
• OpenShot
• Pitivi
• Shotcut
• VirtualDub
• VirtualDubMod
• VideoLAN Movie Creator

  Video encoders

• Avidemux
• HandBrake
• FFmpeg

  Video players

• Media Player Classic
• VLC media player

  Other media packages

• Celtx – Media pre-production software
• Open Broadcaster Software – Cross-platform streaming and recording program

  Networking and Internet

Advertising

• Revive Adserver

  Communication-related

• Asterisk – Telephony and VoIP server
• Ekiga – Video conferencing application for GNOME and Microsoft Windows
• ConferenceXP – video conferencing application for Windows XP or later
• FreePBX – Front-end and advanced PBX configuration for Asterisk
• FreeSWITCH – Telephony platform
• Jitsi – Java VoIP and Instant Messaging client
• QuteCom – Voice, video, and IM client application
• Enterprise Communications System sipXecs – SIP Communications Server
• Slrn – Newsreader
• Twinkle – VoIP softphone
• Ring – Cross-platform, peer to peer instant-messaging and video-calling protocol that offers end-to-end encryption and SIP client
• Tox – Cross-platform, peer-to-peer instant-messaging and video-calling protocol that offers end-to-end encryption

  E-mail

• Geary – Email client based on WebKitGTK+
• Mozilla Thunderbird – Email, news, RSS, and chat client

  File transfer

Grid and distributed processing

• GNU Queue
• HTCondor
• OpenLava
• pexec

  Instant messaging

IRC Clients

Middleware

• Apache Axis2 – Web service framework
• Apache Geronimo – Application server
• Bonita Open Solution – a J2EE web application and java BPMN2 compliant engine
• GlassFish – Application server
• Jakarta Tomcat – Servlet container and standalone webserver
• JBoss Application Server – Application server
• ObjectWeb JOnAS – Java Open Application Server, a J2EE application server
• TAO – C++ implementation of the OMG's CORBA standard
• Enduro/X – C/C++ middleware platform based on X/Open group's XATMI and XA standards

  RSS/Atom readers/aggregators

• Akregator – Platforms running KDE
• Liferea – Platforms running GNOME
• RSS Bandit – Windows, using.NET Framework
• RSSOwl – Windows, Mac OS X, Solaris, Linux using Java SWT Eclipse
• Sage

  Peer-to-peer file sharing

• Popcorn Time – Multi-platform, free, and open-source media player
• qBittorrent – Alternative to popular clients such as μTorrent

  Portal Server

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

  Remote access and management

• FreeNX
• OpenVPN
• rdesktop
• Synergy
• VNC
• Remmina

  Routing software

Web browsers

• Brave – web browser based on the Blink engine
• Chromium – Minimalist web browser from which Google Chrome draws its source code
• Falkon – web browser based on the Blink |Blink engine
• Firefox – Mozilla-developed web browser using the Gecko layout engine
• Midori – Lightweight web browser using the WebKit layout engine
• Tor Browser – Modified Mozilla Firefox ESR web browser
• Waterfox – Alternative to Firefox
• SeaMonkey – Internet suite

  Webcam

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

  Webgrabber

• cURL
• HTTrack
• Wget

  Web-related

• Apache Cocoon – A web application framework
• Apache – The most popular web server
• AWStats – Log file parser and analyzer
• BookmarkSync – Tool for browsers
• Cherokee – Fast, feature-rich HTTP server
• curl-loader – Powerful HTTP/HTTPS/FTP/FTPS loading and testing tool
• FileZilla - FTP
• Hiawatha – Secure, high performance, and easy-to-configure HTTP server
• HTTP File Server – User-friendly file server software, with a drag-and-drop interface
• lighttpd – Resource-sparing, but also fast and full-featured, HTTP Server
• Lucee – CFML application server
• Nginx – Lightweight, high performance web server/reverse proxy and e-mail proxy
• NetKernel – Internet application server
• Qcodo – PHP5 framework
• Squid – Web proxy cache
• Vaadin – Fast, Java-based framework for creating web applications
• Varnish – High-performance web application accelerator/reverse proxy and load balancer/HTTP router
• XAMPP – Package of web applications including Apache and MariaDB
• Zope – Web application server

  Web search engines

• Searx – Self-hostable metasearch engine
• YaCy – P2P-based search engine

  Other networking programs

• JXplorer – LDAP client
• Nextcloud – A fork of ownCloud
• OpenLDAP – LDAP server
• ownCloud – File share and sync server
• Wireshark – Network monitor

  Office suites

• Apache OpenOffice
• Calligra Suite – The continuation of KOffice under a new name
• LibreOffice – Independent Work of OpenOffice.org with a number of enhancements
• ONLYOFFICE Desktop Editors – An open-source offline edition of the Cloud

  Operating systems

Emulation and Virtualisation

• DOSBox – DOS programs emulator
• VirtualBox – hosted hypervisor for x86 virtualization

  Personal information managers

• Chandler – Developed by the OSAF
• KAddressBook
• Kontact
• KOrganizer
• Mozilla Calendar – Mozilla-based, multi-platform calendar program
• Novell Evolution
• Perkeep - Personal data store for pictures
• Project.net – Commercial Project Management
• TeamLab – Platform for project management and collaboration

  Programming language support

Bug trackers

• Bugzilla
• Mantis
• Mindquarry
• Redmine
• Trac

  Code generators

• 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
• Kodos
• Open Scene Graph – 3D graphics application programming interface
• OpenSCDP – Open Smart Card Development Platform
• phpCodeGenie
• SableCC – Parser generator for Java and.NET
• SWIG – Simplified Wrapper and Interface Generator for several languages
• ^txt2regex$
• xmlbeansxx – XML Data Binding code generator for C++
• YAKINDU Statechart Tools – Statechart code generator for C++ and Java

  Documentation generators

• Doxygen – Tool for writing software reference documentation. The documentation is written within code.
• Mkd – The software documentation is extracted from the sources files, from pseudocode or comments.
• Natural Docs – Claims to use a more natural language as input from the comments, hence its name.

  Configuration software

• Autoconf
• Automake
• BuildAMation
• CMake

  Debuggers (for testing and trouble-shooting)

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

  Integrated development environments

Version control systems

Risk Management

• Active Agenda – Operational risk management and Rapid application development platform

  Science

Bioinformatics

Cheminformatics

• Chemistry Development Kit
• JOELib
• OpenBabel

  Electronic Lab Notebooks

• ELOG
• Jupyter

  Geographic Information Systems

Geoscience

Grid computing

• P-GRADE Portal – Grid portal software enabling the creation, execution and monitoring of workflows through high-level Web interfaces

  Microscope image processing

• 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
• 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

  Molecular dynamics

• GROMACS – Protein, lipid, and nucleic acid simulation
• LAMMPS – Molecular dynamics software
• MDynaMix – General-purpose molecular dynamics, simulating mixtures of molecules
• NAMD – Parallel efficient simulation of large systems involving millions of atoms
• NWChem – Quantum chemical and molecular dynamics software

  Molecule viewer

• Avogadro – Plugin-extensible molecule visualisation
• BALLView – Molecular modeling and visualisation
• Jmol – 3D representation of molecules in a variety of formats, for use as a teaching tool
• Molekel – Molecule viewing software
• MeshLab – Able to import PDB dataset and build up surfaces from them
• PyMOL – High-quality representations of small molecules as well as biological macromolecules
• QuteMol – Interactive molecule representations offering an array of innovative OpenGL visual effects
• RasMol – Visualisation of biological macromolecules

  Nanotechnology

• Ninithi – Visualise and analyse carbon allotropes, such as Carbon nanotube, Fullerene, Graphene nanoribbons

  Plotting

Quantum chemistry

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

  Screensavers

• BOINC
• Electric Sheep
• XScreenSaver

  Statistics

• LimeSurvey – Online survey system

  Theology

Bible study tools

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

  Typesetting

General directories

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