This is a list of free and open-source software 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. 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.
General
OpenCog A 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.
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
FreeCAD
LibreCAD
Blender; 3D modeling software written in C, C++ and Python containing cloth, hair, fluid and rigid body simulation techniques
SimPy; queue-theoretic event-based simulator written in Python
flightgear is an open-source flight simulator written for Windows, Mac OS X, and GNU/Linux.
Adempiere — Enterprise resource planning(ERP) business suite
Bitcoin Core — Peer-to-peer decentralised digital currency.
Bonita Open Solution — Business Process Management
CiviCRM – Constituent Relationship Management software aimed at NGOs
Compiere — ERP solution automates accounting, supply chain, inventory, and sales orders
Cyclos — Software for microfinance institutions, complementary currency systems and timebanks
Dolibarr — Web-based ERP system.
GnuCash — Double-entry book-keeping
HomeBank — for personal use
Ino erp — Dynamic Pull Based System ERP
jFin
JFire — An ERP Business Suite written with Java and JDO
KMyMoney — Double-entry book-keeping
LedgerSMB — Double-entry book-keeping
metasfresh - ERP Software
Mifos — Microfinance Institution management software
Openbravo
OrangeHRM — Commercial Human Resource Management
Postbooks — Integrated Accounting and ERP Business Suite
QuickFIX — FIX protocol engine written in C++ with additional C#, Ruby, and Python wrappers
QuickFIX/J — FIX protocol engine written in Java
SQL Ledger — Double-entry book-keeping
SugarCRM — Commercial Customer Relationship Management
Tryton
TurboCASH — Double-entry book-keeping for Windows
Evergreen
Koha
NewGenLib
OpenBiblio
PMB
refbase — Web-based institutional repository and reference management software
Darktable — Digital image workflow management, including RAW processing
digiKam — Integrated photography toolkit including editing capabilities
GIMP — GNU Image Manipulation Program
Inkscape — An open-source vector graphics editor
Krita — Digital painting and sketching application
RawTherapee — Digital image workflow management, including RAW processing
See Comparison of reference management software.
See List of open source bioinformatics software.
Chemistry Development Kit
JOELib
OpenBabel
P-GRADE Portal — Grid portal software enabling the creation, execution and monitoring of workflows through high-level Web interfaces
CellProfiler
Endrov
FIJI (software)
Ilastik
ImageJ
IMOD
ITK
KNIME
OsiriX
VTK
3DSlicer
Abalone
Ascalaph Designer
GROMACS
LAMMPS
MDynaMix
NAMD
NWChem
Avogadro
BALLView
Jmol
Molekel
MeshLab, able to import PDB dataset and build up surfaces from them
PyMOL
QuteMol
RasMol
Ninithi — visualize and analyze the carbon allotropes such as Carbon nanotube, Fullerene, Graphene nanoribbons
Active Agenda — Operational risk management and Rapid application development platform
LimeSurvey — Online survey system
CP2K
GAMESS (US)
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
Modular Audio Recognition Framework — voice, audio, speech NLP processing
NonVisual Desktop Access — (NVDA) Screen reader for Windows
Text2Speech — Lightweight and easy to use Text-To-Speech (TTS) Software
Dasher — Unique text input software
Gnopernicus — AT suite for GNOME 2
Virtual Magnifying Glass — a multi-platform screen magnification tool.
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.
SCaViS — Java-based data analysis framework
Konstanz Information Miner (KNIME)
OpenNN — Open-source neural networks software library written in the C++ programming language.
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 previous 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 is a toolkit for 3D computer graphics, image processing and visualization.
ResourceSpace - Widely used system with roots in the NGO sector
ApexKB, formerly known as Jumper
Lucene
Nutch
Solr
Xapian
Konstanz Information Miner (KNIME)
Pentaho
SpagoBI
Talend
OpenAFS — a distributed file system supporting a very wide variety of operating systems
Tahoe-LAFS — a distributed file system/cloud storage system with integrated privacy and security features
CephFS — a distributed file system included in the Ceph storage platform.
OpenX
Asterisk — Telephony and VoIP server
Ekiga — Video conferencing application for GNOME and Microsoft Windows
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 — a newsreader
Twinkle — VoIP softphone
Mozilla Thunderbird
Inky
Geary (software)
Grid and distributed processing
GNU Queue
HTCondor
OpenLava
pexec
Apache Axis2 — Web service framework (implementations are available in both Java & C)
Apache Geronimo
Bonita Open Solution(software) — a J2EE web application and java BPMN2 compliant engine
GlassFish Application Server
Jakarta Tomcat — a servlet container and standalone webserver
JBoss Application Server an application server
ObjectWeb JOnAS — Java Open Application Server, a J2EE application server
TAO (software) — C++ implementation of the OMG's CORBA standard
Enduro/X – C/C++ middleware platform based on X/Open group's XATMI and XA standards
Akregator — Platforms running KDE
Liferea — Platforms running GNOME
RSS Bandit — Windows – .NET Framework
RSSOwl — Windows, Mac OS X, Solaris, Linux – Java SWT Eclipse
Sage (Mozilla Firefox extension)
Popcorn Time — multi-platform, free and open source media player
Drupal
eXo Platform
Liferay
Oxwall — Community site software
Sun Java System Portal Server
uPortal
Remote access and management
FreeNX
OpenVPN
rdesktop
Synergy
VNC (RealVNC, TightVNC, UltraVNC)
Remmina
Chromium
Firefox
Midori
Cheese
Guvcview
cURL
HTTrack
Wget
Apache Cocoon — a web application framework
Apache — the most popular web server
AWStats — a log file parser and analyzer
BookmarkSync — a tool for browsers
Cherokee — Speedy, feature rich HTTP Server
curl-loader — a powerful HTTP/HTTPS/FTP/FTPS loading and testing open-source tool
Hiawatha — Secure, high performance and easy-to-configure HTTP server
HTTP File Server — a 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 (IMAP/POP3) proxy
NetKernel — an internet application server
Piwik — a web analytics system
Qcodo — a PHP5 framework
Squid (software) — web proxy cache
Vaadin — a fast to use java based framework for creating web applications
Varnish (software) — high-performance web application accelerator/reverse proxy and load balancer/HTTP router
XAMPP — a package of web applications including Apache and MariaDB
Zope — a web application server
JXplorer — a LDAP client
OpenLDAP — a LDAP server
openVXI — a VoiceXML interpreter
YaCy — P2P-based search engine
ownCloud – a file share and sync server
Wireshark - A Network Monitor
ATutor — a web-based Learning Content Management System (LCMS)
Chamilo — a web-based e-learning and content management system
Claroline — a collaborative Learning Management System
DoceboLMS
eFront — an icon-based learning management system
FlightPath — academic advising software for universities
GCompris
Gnaural — Brainwave entrainment software
IUP Portfolio
ILIAS — a web-based learning management system (LMS)
Moodle — a free and open-source learning management system
OLAT — a web-based Learning Content Management System
Omeka
openSIS — a web-based Student Information and School Management system
Sakai Project — a web-based learning management system
SWAD – a web-based learning management system
Tux Paint — a paint application for 3–12 year olds
KGeography
Kiten
KVerbos
KTouch
Tux Typing
KEduca
WINE
CyberBrau
Pencil2D
Pivot Animator
Synfig
Tupi (formerly KTooN)
OpenToonz
Blender
K-3D
OpenFX
Seamless3d
Pencil2D (for animations)
SWFTools (for scripting)
Eye of GNOME
F-spot
Geeqie
Gthumb
Gwenview
Kphotoalbum
Opticks
Dr. DivX
FFmpeg
MEncoder
OggConvert
Avidemux
AviSynth
Blender
Cinelerra
DScaler
DVD Flick
Kaltura
Kdenlive
Kino
LiVES
Natron
OpenShot Video Editor
Pitivi
Shotcut
VirtualDub
VirtualDubMod
VideoLAN Movie Creator
Avidemux
HandBrake
VLC
Media Player Classic
Celtx — Media Pre-production Software
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.
Emulation and Virtualisation
VirtualBox
KeePass
Password Safe
Mitro
Chandler — developed by the OSAF.
KAddressBook
Kontact
KOrganizer
Mozilla Calendar — A Mozilla-based, multi-platform calendar program.
Novell Evolution
OpenSync (software)
Project.net — Commercial Project Management
TeamLab — Platform for project management and collaboration
Bugzilla
Mantis
Mindquarry
Redmine
Trac
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
Doxygen : a 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.
Autoconf
Automake
BuildAMation
CMake
Debuggers (for testing and trouble-shooting)
GNU Debugger — "works for many programming languages [...]"
Memtest86 — Stress-tests RAM on x86 machines
Xnee — Record and replay tests
BOINC
Electric Sheep
XScreenSaver
ClamAV
ClamWin
Gateway Anti-Virus
Lynis
MyDLP
dvdisaster
Foremost
PhotoRec
TestDisk
The Coroner's Toolkit
The Sleuth Kit
Anti-forensics
USBKill
DBAN
srm
GnuPG
GnuTLS
KGPG
OpenSSL
Seahorse
Signal
TextSecure
wolfCrypt
CrossCrypt
FreeOTFE and FreeOTFE Explorer
eCryptfs
Mydiamo
Coyote Linux
Firestarter
IPCop
IPFilter
IPFire
ipfw
iptables
M0n0wall
PeerGuardian
PF
pfSense
Rope
Shorewall
SmoothWall
Untangle
Vyatta
Cyberduck — Mac OS X and Windows client (since version 4.0)
Lsh — server and client (supporting SRP and Kerberos authentication)
OpenSSH — client/server
PuTTY — client only
BibleDesktop — For Cross-platform
BibleTime — For Linux using KDE
Go Bible — For Java Mobile Phones
jSword — For Java
MacSword — For Mac OS X
Marcion — For Linux and Windows, using Qt UI Framework and embedded MySQL server
openlp.org — Worship presentation software for churches to display songs, bibles, movies etc.
SwordBible — For Windows
The SWORD Project for Windows — For Windows
Xiphos The_SWORD_Project — For Linux using GNOME
