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Open Source
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0xdata (2011)
10 open source projects worth checking out
21 Awesome (But Lesser-Known) Open-Source Applications for Windows
7-Zip
A Code of Conduct for Open Source Projects
AbiWord
Accelerated Mobile Pages (2015 AMP)
Activepieces
Adeona
Affine
AmpliFeeder
Angular 2+ (2016)
AngularJS (2009)
Anthologize
Anytype.io
ArangoDB (2011)
ArtCraft
AssaultCube
Asterisk (1999 virtual PBX)
ATutor
Automatisch
Avalanche Corporate Technology Cooperative
Backreads
Banshee
Baserow
Berkeley Open Infrastructure for Network Computing (BOINC)
BetterMeans
BigBluebutton (2007)
binarSea (2012)
BitNami
bitwarden (2016)
Blender 3D
Blockcerts
Bonfire (2020)
Briar
Buzz (2026 open Slack/github)
Cactus (sw)
Cappuccino Web Framework
CASH Music
Catarse (catharsis?)
Cayley
Celestia
Ceph
Chayn (2013)
Chromium
Clawdbot (2026)
Cloud Foundry (2011)
Coauthor (sw)
Cocos Creator, Cocos2dx, Cocos Engine (2010)
Cocreate Shared Whiteboard
Cogment (2019)
CoMakery/self-organization-constitution
CommunityForge.net
Compiere
concrete5
Constellation
Cotoami (coto.me)
Cringely OpenTV Project
Crowdring
CryptPad
CyanogenMod (2009)
Darwin Streaming Server
DBRX (2024)
Debate Hub
decidim.barcelona (2016)
DeepaMehta
Dendron
Dia
Diagram Designer
DISARM Foundation
Discourse (2013)
DMX (2018)
Docker, The linux container engine (2013)
Docs (docs.numerique.gouv.fr)
dokieli
dotProject.net
Earth Species Project (2017 ESP)
Echoprint
Elasticsearch (2010)
Electric Sheep (screen saver)
Electron (2013)
Elgg
enCore
enso.org
Erlang (1996 programming language)
EtherPad (2008)
Eureka Streams
Evernym (2016)
Excalidraw (2020)
eZ Publish
FFmpeg
FLECS (2019 Fast Lightweight Entity Component System)
Foam
Focused
Framatalk
Frame AI Glasses (2024, $350)
Freeplane (2007 fork from FreeMind)
Fritzing
Fuchsia (2016)
Fuse
g0v (2014)
Geeklog
Gephi (2008)
Ghost (2013)
giscus
Globus Project
GnuCash
Go (2007 Programming Language golang)
Godot Engine (2008)
Google Open Source (2017)
google-blockly (2012)
Gradle (2007)
Grafana Labs (2014)
Graphbrain (library)
GrapheneOS (2018 as CopperheadOS)
Graphviz (1991 or earlier)
GRASS
Grav (2015)
Gridbus
Grist (2014)
GroupServer
H5P (2013)
Habitica (was HabitRPG)
hakimel/reveal.js
HandBrake
Helma Object Publisher (Hop)
hiconic-os
Homebrew (2009)
Horto domi: the Open Garden by Outer Babylon
Hypertable
IBM Open Source Initiatives
ImageMagick (1987)
Infinite Reality Engine (iR Engine)
Inkscape
InMoov: open-source 3D printed life-size robot
IoTivity (2015)
IPFS (Inter Planetary File System)
JasperSoft
JBoss Foundation
Jitsi.org (2003 as SIP Communicator)
Joomla (2005)
Joplin (2017)
JSON Canvas (2024 rebranding)
K-Scale Labs
Kaltura (2006)
KARLProject (2008 Knowledge And Resource Locator)
Karrot
Katalabs
kmapper
KnownSpace
Krita (2005)
Laconica
LanguageTool (2005)
Lexon
LibreOffice Productivity Suite (2011)
Linaro (2010)
listmonk
logseq
Long Now Timeline
Lucene
Lucida.ai (started as Sirius)
Maccy (macOS clipboard manager)
maemo.org
Magpie
Mailman (1999)
Maltego 3
Manubot
mastodon.social (2016)
Mattermost (2015)
MediaGoblin (2011)
Memory Pool System
Mercurial SCM (2005)
Mermaid (2014)
Mifos Initiative (2011)
MindMup (2013)
Miracast
Miro (2006 video app)
MLDB: The open-source Machine Learning Database
models/syntaxnet (Parsey McParseface)
Monetas
MongoDB (2008)
Moodle
MoonRay Production Renderer
moshi.chat (2024)
MP3Gain
Mukurtu Archive
MultiChain
Nagios
Nava Strata (2025)
neo4j (2007 open source nosql graph database)
Netlify CMS
Nikola (SSG)
nitter.net (anonymous front end to Twitter)
NocoDB
Nooron
Nortantis Fantasy Map Creator
Notesnook (2019)
Numenta Platform for Intelligent Computing (NuPIC)
Nutch (2003)
Nutshell: make expandable explanations
nvALT
Nvu
OBS (2012 Open Broadcaster Software)
OCaml (1996)
Odoo (2005 as TinyERP, then OpenERP)
Ogg Vorbis (2000)
OLAT (Online Learning And Training)
Omeka (2008)
One Shall Pass
Open 311
Open Babel
Open Bank Project
Open Exhibits
Open Geospatial Consortium (1994 OGC)
Open Idea Project
Open Invention Network (OIN)
Open Seadragon
Open Source Appropriate Technology
Open Source Artificial Intelligence
Open Source Circular Economy
Open Source Computer Vision
Open Source CRM Systems
Open Source Digital Voting Foundation
Open Source GIS Projects
Open Source Hardware
Open Source LLMs
Open Source Marketing Project
Open Source Permaculture
Open Source SNSes
Open Source Submarine
Open Source Video Editing Tools
Open Watson Competitors
Open-Search Initiative
Open-Source Bounties
Open-Source NLP Tools
OpenAPS
OpenBazaar (2014)
OpenBTS
openCOLA
OpenDarwin
OpenELM (2024)
openFrameworks
OpenGoo
OpenGroupware.org
OpenLab
OpenLaszlo
Openmappr
OpenMRS
OpenNMS
OpenOffice.org
OpenPencil
OpenPilot
OpenPipeline
OpenSpace
OpenWorm
osCommerce
OSINT (Open Source Intelligence)
ourproject
ownCloud.org (2010)
Pachyderm (sw)
Pandoc (2006)
Pathways to Enable Open-Source Ecosystems (POSE)
PeerTube (2017 as Chocobozzz)
Pentaho (2004)
Permissioning the City (PtC)
Pharo Open Source Smalltalk (2008 fork of Squeak)
PhoneGap
PHP (1995 as Personal Home Page, later also Hypertext Preprocessor)
Pilgrim
PingID
PINO
Piwik
Pixelfed (2018)
Platform Design Toolkit (PDT)
POC21 (2015 Proof of Concept 21)
PolitEcho (2016)
Pressbooks
Processing.org
Profiles RNS Software
Project Blacklight
Project Delta
ProseMirror
Public AI Inference Utility
pyRevit (2014)
PyTorch (2016)
R Project for Statistical Computing
Reachy Mini ($450)
React (2013 JavaScript library)
Really Slick Screensavers
Riot
Rojo
Roundware
Sage Maths
Sakai
Scalar (2015)
Sensorica (2011)
ShiftSpace (2006-2011)
SIDN (1986 Stichting Internet Domeinregistratie Nederland)
SilverStripe
Sinapse
Sirius
Six Easy Pieces of Quantitatively Analyzing Open Source Projects
smarty
Snort (1998)
Soashable
Solr
Songbird Media Player
SourceCred
SourceForge Hosted Projects
Spectacle Editor (2016)
SpringSource
Squeak (1996)
sr.ht
StatusNet (at status.net)
steampipe.io
Story Mixer
Strong Angel (2000)
Subversion (the app)
SurrealDB
Syncthing (2013)
Synergy (KVM)
Syzygy
tauri.app
tea
TellForm
TensorFlow (2015)
Termineter
TerminusDB (2019)
TextPattern
The Coral Project
The CouchDB Project (2005)
The eGovOS Project
The Ogg Project
The Open Application Network (OAN)
The Plesh Project
TheOpenCD.org
Thimbl (art project)
ThinkCycle
Tomboy
topoteretes/cognee
Torch
Tornado (web server)
TRON (the OS)
TWiki (1998)
Twine (2009)
Unhangout
Ushin (Universal Shared Information)
utterances
Visual Budget
Vores Øl
Vyatta
Weaviate Vector Search Engine
WebKit
WebRTC (2011)
Wekan
Wiring
Wit (2013)
World Monitor (2026)
WorldVistA
Worldwide Lexicon
WriteFreely
XBMC
XenSource
XMind
YaBB
Zettlr (2017)
Zeugma (project)
Zimbra (formerly Liquid Systems)
Zulip (2012)
Jumps
Contributor Covenant (2014)
Open Core Model (2008)
Open Projects Net