| Name | Technologies | Topics |
|---|---|---|
| 3DTK | c/c++, cmake, opencv, ros, boost | Science and Medicine, 3d, point clouds, slam, robotics, mapping |
| 52° North Initiative for Geospatial Open Source Software GmbH | javascript, java, spring, r, big data | Science and Medicine, geoinformatics, geoprocessing, remote sensing, geostatistics, sensor web |
| AerospaceResearch.net | python, c/c++, vhdl, boinc, java | Science and Medicine, cubesats, space applications, software defined radio, distributed computing, simulations |
| aimacode | python, java, javascript, ai, jupyter | Programming Languages and Development Tools, artificial intelligence, machine learning, education |
| Amahi | ruby on rails, golang, swift, javascript, android | Operating Systems, media server, storage server, streaming, web apps, front-end |
| AOSSIE - Australian Open Source Software Innovation and Education | scala, isabelle proof assistant, browser extension, javascript/html5/css3, android/ios | Web, logic, electronic voting, philosophy, environment, natural language processing |
| Apache Software Foundation | c, java, erlang | Other, other, cloud, libraries, big data |
| Apertium | c++, python, xml, fsts | Other, machine translation, language technology, grammar, natural language processing |
| Apertus Association | fpga, embedded, linux, c/c++, vhdl | Graphics / Video / Audio / Virtual Reality, vision, camera, cinematography, digital imaging, photography |
| appleseedhq | c/c++, qt | Graphics / Video / Audio / Virtual Reality, graphics, rendering, physics, mathematics, high performance |
| ArduPilot | drones, python, linux, c/c++, robotics | End User Applications, vision, robotics, embedded systems, real-time os, drones |
| BeagleBoard.org Foundation | linux, gcc, real-time, physical computing, iot | Programming Languages and Development Tools, robotics, ros, audio, iot, interfaces |
| Beam Community | erlang, xmpp | Programming Languages and Development Tools, distributed computing, real time, distributed databases, iot, instant messaging |
| BeeWare Project | python, ios, android, javascript, java | Programming Languages and Development Tools, mobile, cross desktop, app development |
| Berkman Klein Center for Internet & Society at Harvard University | ruby on rails, meteor.js, elasticsearch, javascript, elk | Other, web, research, education, internet freedom, internet censorship |
| Blender Foundation | c, c++, python, opengl, opencl | Graphics / Video / Audio / Virtual Reality, animation, rendering, 3d, games, simulation |
| Boost C++ Libraries | c++11, c++14, c++, c++17 | Programming Languages and Development Tools, c++ development, c++ tools, c++ standardization, software engineering |
| Boston University / XIA | xia, linux kernel, c, advanced data structures, ddos | Cloud, computer networking, future internet architecture, research |
| BRL-CAD | c/c++, qt, opengl, opencl, tcl/tk | Graphics / Video / Audio / Virtual Reality, cad, geometry, 3d, graphics user interface, software visualization |
| Canadian Centre for Computational Genomics | r, perl, awk, bash, python | Science and Medicine, bioinformatics, data science, next-generation sequencing, visualization, statistics |
| Catrobat | java, android, ios, espresso | Programming Languages and Development Tools, programming language, app development, education, scratch |
| CCExtractor Development | c, python, arduino, node.js, c# | Graphics / Video / Audio / Virtual Reality, media, subtitles, video, accesibility, language |
| Center for Research In Open Source Software (CROSS) at UC Santa Cruz | ceph, hadoop, c++, javascript, python | Other, distributed networks, reproducibility, storage systems, big data, opendata |
| CERN-HSF | c/c++, python, data analysis, machine learning, parallelization | Science and Medicine, particle physics, high-energy physics, physics, big data, machine learning |
| CGAL Project | c++, github, git | Science and Medicine, computational geometry, geometry, mesh processing, arrangement, webhook |
| CHAOSS: Community Health Analytics Open Source Software | python 3, javascript | End User Applications, data visualization, visualization, machine learning |
| Checker Framework | java | Programming Languages and Development Tools, programmer productivity, software engineering, verification, bug finding |
| CiviCRM LLC | php, mysql, angularjs, d3.js | End User Applications, civil society, contacts&calendar sync |
| Classical Language Toolkit | python, javascript | Other, natural language processing, web |
| CLiPS, University of Antwerp | python, javascript, mongodb | Data and Databases, natural language processing, machine learning, artificial intelligence, text analysis, text generation |
| Cloud Native Computing Foundation (CNCF) | kubernetes, prometheus, grpc, docker, golang | Cloud, cloud, container, monitoring, logging |
| CloudCV | machine learning, deep learning, computer vision, artificial intelligence, cloud | Cloud, python, tensorflow, django, angularjs, react |
| coala | django, python 3, antlr, emberjs, reactjs | Programming Languages and Development Tools, code analysis, chatops, devops, language server, dependency management |
| Computational Biology | javascript, webgl, reactjs, flask | Science and Medicine, biological networks, bioinformatics, network simulation, computational biology, omics data |
| Conversations.im | java, android, xmpp, gtk, javascript | Social / Communications, instant messaging, mobile, desktop, web |
| Cuneiform Digital Library Initiative | python, mariadb, rdf, php, nltk | Data and Databases, natural language processing, machine translation, information retrieval, linguistics, semantic web |
| DBpedia | rdf, scala, sparql | Data and Databases, knowledge graph, data extraction, data analytics |
| Debian Project | javascript, ruby, java, python, c/c++ | Operating Systems, operating system, packaging, applications, community, communications |
| Developers Italia | python, ruby, node.js, java, c/c++ | Other, government, open data, identity, data-science |
| Digital Impact Alliance | android, java, php, python, javascript | End User Applications, humanitarian, international, social good, charity, health |
| Django Software Foundation | python, django | Web, web development, web, web applications |
| Drupal | web, web development, content management system, cms, object-oriented | Web, php, symfony, sql, javascript, drupal 8 |
| Earth Science Information Partners (ESIP) | kubernetes, dask, xarray, python, javascript | Data and Databases, earth data, semantics, discovery, data visualization, earth science |
| Elastic | java, golang, node.js, react, jruby | Data and Databases, data analytics, data visualization, monitoring, search, logging |
| Eta | haskell, jvm, java | Programming Languages and Development Tools, functional-programming, runtime systems, compilers, programming-tools |
| Fedora Project | linux, python, git, postgresql, ansible | Operating Systems, linux distribution, desktop, community, web development, server |
| FFmpeg | c, asm, git | Graphics / Video / Audio / Virtual Reality, audio, video, multimedia, subtitles |
| FOSSASIA | java, javascript, python, android, artificial intelligence | Web, web development, artificial intelligence, personal assistants |
| FOSSology | php, postgresql, lamp, linux, c/c++ | Other, licensing, open source, license compliance, compliance, spdx |
| Free and Open Source Silicon Foundation | fpga, verilog, c, chisel, synthesis | Other, open hardware, debugging, eda tools, web community |
| Free UK Genealogy | mongodb, ruby on rails, mysql, python, css/html | Data and Databases, ai, machine learning, ui/ux, web apps, open data |
| FreeBSD | c/c++, llvm, shell script, assembly, make | Operating Systems, virtualization, kernel, cloud, embedded systems, security |
| FreeType | c, gnu make, gnu autotools, python, fonts | Graphics / Video / Audio / Virtual Reality, fonts, truetype, opentype, graphics, rendering |
| freifunk | openwrt, javascript, html, c, python | Social / Communications, network, wireless, web applications, embedded systems, software-defined networking |
| Genes, Genomes and Variation | perl, mysql, java script | Science and Medicine, data visualization, genomics, database, bioinformatics |
| GENIVI Alliance | yocto, c/c++, java | Operating Systems, automotive, diagnostics, functional safety, middleware |
| Gentoo Foundation | shell script, bash, c/c++, python, linux | Operating Systems, operating systems, package management, embedded systems, security, init systems |
| GFOSS - Open Technologies Alliance | python 3, php/javascript/html, css/html, java, c/c++ | Other, python, gtk, java jsp, c++ tools, javascript |
| Git | c, shell script, git | Programming Languages and Development Tools, version control, dvcs |
| Global Alliance for Genomics and Health | java, python, cloud, c/c++, mongodb | Science and Medicine, genomics, genetics, standards, bioinformatics, web |
| GNOME | c, python, javascript, gtk+, gobject | Operating Systems, desktop, applications, end user applications, operating system |
| GNSS-SDR | c/c++, gnss, c++11, c++14 | Science and Medicine, gnss, navigation, digital signal processing, software defined radio, communications engineering |
| GNU Compiler Collection (GCC) | c++, c, openmp | Programming Languages and Development Tools, compilers |
| GNU Octave | c++, hg | Programming Languages and Development Tools, mathematics, numerical computation, matlab, scientific computing, numerical methods |
| GNU Project | c, lisp, python | Operating Systems, free software, operating system |
| GNU Radio | c++, python, simd, qt | End User Applications, software defined radio, real-time, communications engineering, cybersecurity, dsp |
| Godot Engine | c++, cpp, opengl, github, crossplatform | Graphics / Video / Audio / Virtual Reality, game engine, gaming, game development, rendering, virtual reality |
| gRPC | grpc, microservices, distributed systems, cloud | Cloud, microservices, communications, distributed networks, infrastructure, middleware |
| Haiku | c++, webkit, ffmpeg, posix, bsd unix | Operating Systems, desktop, network, kernel, graphics, media |
| Haskell.org | haskell | Programming Languages and Development Tools, functional-programming, programming languages |
| Homebrew | ruby, git, macos, rspec, bash | Programming Languages and Development Tools, package managers, macos, terminal applications, github |
| INCF | python, c/c++, javascript, cuda, xml | Science and Medicine, neuroscience, big data, brain simulation, brain imaging, visualization |
| Inclusive Design Institute | javascript, html, css, node.js, php | End User Applications, accessibility, inclusivity, web, web applications, web development |
| Inkscape | svg, css, c++11, python, gtk+ | Graphics / Video / Audio / Virtual Reality, graphics, web, geometry |
| Inria Foundation | c/c++, qt, webassembly, asm, communication protocol | Science and Medicine, medical simulation, medical research, physics, real-time, scientific computing |
| Institute for Artificial Intelligence | c++, python, ros, unreal engine, lisp | Science and Medicine, artificial intelligence, robotics, simulation, unreal engine, perception |
| Intel Media And Audio For Linux | video, codecs, hardware acceleration, va-api, c | Graphics / Video / Audio / Virtual Reality, video decode, video encode, video post processing, hardware accelerated media processing, video apis |
| InterMine | postgresql, java, javascript, python, clojure | Science and Medicine, biology, genomics, data science, open science, bioinformatics |
| Internet Archive | pthon, javascript | Web, web extensions, voice apps, web archiving |
| Internet Systems Consortium | dhcp, c/c++, mysql, cassandra, rest | Operating Systems, networking, stateful, infrastructure, ipv6 |
| JBoss Community | java, android, ios, opentracing, apache kafka | Programming Languages and Development Tools, testing, cloud, mobile development, javaee, microservices |
| JdeRobot - Universidad Rey Juan Carlos | ros, python, c++, gazebo, opencv | Other, robotics, computer vision, robot simulator, teaching |
| Jenkins project | java, groovy, javascript | Programming Languages and Development Tools, devops, development tools, continuous integration |
| JGraphT | java | Programming Languages and Development Tools, graphs, algorithms, data structures, mathematics, network analysis |
| Jitsi | java, javascript, webrtc, react, react native | Social / Communications, real time communications, web, video conferencing, networking, multimedia |
| Joomla! | php, javascript, mysql, html5/css3, cms | Web, web, web development, web applications, cms, object-oriented |
| JSK Robotics Laboratory / The University of Tokyo | ros | Science and Medicine, robotics |
| KDE Community | qt, c/c++, qml | End User Applications, applications, desktop environment |
| Kiwix | android, java, c++, python, qt | End User Applications, offline, android |
| LabLua | lua, céu | Programming Languages and Development Tools, programming languages |
| languagetool.org | java, javascript, machine learning, ai, tensorflow | End User Applications, artificial intelligence, language, edtech, education, nlp |
| LEAP Encryption Access Project | python, twisted, javascript, openvpn, gnupg | End User Applications, e2e, mail, vpn, encryption |
| LibreHealth | java, php, javascript, mysql, webcomponents | Science and Medicine, web apps, health, ictd, medicine, global health |
| LibreOffice | c++, java, python | End User Applications, end user applications, office suite, desktop application, android |
| libvirt | hypervisor, kvm, xen, lxc | Cloud, virtualization, virtual machine, container |
| LLVM Compiler Infrastructure | llvm | Programming Languages and Development Tools, compilers, compiler api |
| LuaRocks | lua, linux, windows, unix, c | Programming Languages and Development Tools, programming language, package manager |
| MariaDB Foundation | mariadb, mysql, c, c++, java | Data and Databases, database, sql |
| Matrix.org | golang, ios, android, python, react | Social / Communications, real time communications, team chat, voip, instant messaging, decentralization |
| MetaBrainz Foundation Inc. | python, perl, javascript, postgresql, react | Data and Databases, music, metadata, big data, community |
| Metasploit | ruby, postgresql, python, c, assembly | Security, security, penetration testing, offensive security, exploitation |
| Mixxx DJ Software | qt, audio, music, real-time, c++ | Graphics / Video / Audio / Virtual Reality, beatdetection, metadata |
| mlpack | c++ | Data and Databases, machine learning, deep learning, algorithms, data science |
| Mobile Robot Programming Toolkit (MRPT) | c/c++, cmake, python, webs | Science and Medicine, robot, ai, computer vision, real-time, slam |
| Moodle | php, javascript, ionic, sql, angular | Social / Communications, education, web applications, e-learning, school system, learning management |
| MovingBlocks | java, opengl, json, blender, github | End User Applications, game, voxel, minecraft, sandbox, modding |
| Mozilla | javascript, c++, rust, python, css | Web, open web, free software, web, browser |
| MuseScore | qt, c++11, cpp, midi | Graphics / Video / Audio / Virtual Reality, music, music notation, user interface, end user applications, sheet music |
| National Resource for Network Biology (NRNB) | java, javascript, python, html, c/c++ | Science and Medicine, network analysis, biology, data visualization, data modeling, web applications |
| Neovim | lua, c, vim, javascript, python | Programming Languages and Development Tools, text editor, vim, cross platform, tools |
| Netfilter project | linux kernel, c | Operating Systems, firewall, computer networking |
| NumFOCUS | python, julia, r, javascript, c++ | Science and Medicine, statistical computing, machine learning, high performance computing, big data, data visualization |
| omegaUp.com | php, mysql, python | Web, cs education, education, web community |
| Open Bioinformatics Foundation | python, javascript, d, php, c/c++ | Science and Medicine, computational biology, bioinformatics, web |
| Open Chemistry | python, c++, javascript, java, opengl | Science and Medicine, science, data science, visualization, chemistry |
| Open Data Kit | android, java | End User Applications, mobile, global development, global health, social good |
| Open Food Facts | perl, mongodb, ios, android, machine learning | Science and Medicine, computer vision, crowdsourcing, open data, food, health |
| Open Roberta Lab | java, javascript | Web, education, programming, robotics |
| Open Source Robotics Foundation | c/c++, python, javascript, ros, gazebo | Programming Languages and Development Tools, robotics |
| Open States | python, django, react, graphql, postgresql | Other, civic tech, scraping, web, government |
| OpenAstronomy | python, julia, c++, numba | Science and Medicine, visualization, astronomy, solar physics, orbital mechanics, high-energy astrophysics |
| OpenCensus | python, java, ruby, node, go | Cloud, tracing, monitoring, c++, php |
| OpenMRS | java, spring, javascript, rest, mysql | Science and Medicine, open source, medical records, developing countries |
| OpenSIPS | c, python, mysql, scripting | Social / Communications, voip, telephony, real-time-communications, sip |
| OpenStreetMap | postgis, java, ruby, javascript, c/c++ | Data and Databases, gis, maps, crowdsourcing, geoinformatics |
| openSUSE | ruby on rail, perl, ruby, html/javascript, c/c++ | Operating Systems, web, qa, packaging, ui/ux |
| OpenWISP | python, django, javascript, openwrt, linux | Web, wifi, mesh-networks, wireless, networking, web development |
| OpnTec | python, javascript, emberjs, cloud, android | Social / Communications, open event, event solutions, web |
| Oppia Foundation | angularjs, python, javascript, appengine, css | Web, education, web, interactive, tools, community |
| OSGeo | c/c++, standards, python, sql, database | Other, mapping, gis, geospatial, citizen science, open science |
| OW2 | java, perl, middleware, bpm, wiki | Other, enterprise information systems, cloud, security, middleware |
| OWASP Foundation | java, net, ruby, javascript, python | Security, application security, cloud security, mobile security |
| P2PSP.org | python, javascript, webrtc, sockets, c/c++ | Graphics / Video / Audio / Virtual Reality, live streaming, real time, distributed networks, p2p, video |
| PEcAn Project | javascript, postgresql, php, c, r | Science and Medicine, scientific visualization, data science, climate science, ecosystem models, ecological forecasting |
| Performance Co-Pilot | python, redis, c, linux, javascript | Operating Systems, high performance computing, visualization, web development, kernel, performance |
| phpBB Forum Software | mysql, javascript, html5/css3, php, symfony | Social / Communications, social, communication, collaboration, forum, community |
| phpMyAdmin | php, mysql, cakephp, jquery, javascript | Data and Databases, mysql, developer, administrator, web applications, database |
| Plone | python, javascript, html, css, reactjs | Web, communications, collaboration, content management, web |
| PMD | java, xml, javacc, antlr, xpath | Programming Languages and Development Tools, code analysis, code quality, source code analyzer, linter |
| Pocket Science Lab | android, java, firmware, c, cad | Science and Medicine, science, education, firmware, school apps |
| Polly Labs | c/c++, llvm, polly, isl, ppcg | Programming Languages and Development Tools, compilers, polyhedral model |
| PostgreSQL | postgresql, sql, rdbms, ordbms, c | Data and Databases, sql, database, big data |
| Probot | javascript, node, github | Programming Languages and Development Tools, bot, automation, development tools |
| Public Lab | ruby on rails, javascript, node.js | Science and Medicine, science, environment, collaboration, community, hardware |
| Purr Data | javascript, html5/css3, node.js, c/c++ | Programming Languages and Development Tools, real-time, audio, dsp, video, data vizualisation |
| Python HYDRA | python, rdf, flask, hydra, json/json-ld | Web, apis, database, functional-programming, semantic web, knowledge graph |
| Python Software Foundation | python | Science and Medicine, programming languages, science |
| QEMU | c, kvm | Cloud, emulation, hypervisor, kernel, lowlevel, cloud |
| Quill.org | ruby, rails, react, javascript, postgresql | Web, education, edtech, machine learning, nlp, web |
| R project for statistical computing | r-project, c, c++, javascript, fortran | Programming Languages and Development Tools, data science, visualization, statistics, graphics, machine learning |
| radare | c, cpp, rust, qt | Security, reverse engineering |
| ReactOS | c, c++ | Operating Systems, operating systems, drivers, desktop, kernel, windows |
| Read the Docs | python, sphinx, django, javascript, elasticsearch | Programming Languages and Development Tools, docs, web, communications |
| Red Hen Lab | python, scikit-learn, tensorflow, singularity, syntaxnet | Science and Medicine, multimedia, audio processing, video processing, artificial intelligence, machine learning |
| RoboComp | c/c++, python, cmake, openscenegraph, ice - zeroc | Other, robotics, computer vision, simulation |
| Rocket.Chat | javascript, ios, android, node, meteor.js | Social / Communications, chat, collaboration, machine learning, chatops, bot |
| Rspamd | c, machine learning, javascript, lua | Security, email, spam filtering, high performance computing |
| RTEMS Project | c, python, posix, bsd unix | Operating Systems, kernel, embedded systems, multicore, iot, real time |
| Ruby | ruby | Programming Languages and Development Tools, programming languages |
| Ruby on Rails | ruby, ruby on rails, html | Web, web, web development, web applications |
| Ruby Science Foundation | ruby, c, c++, cuda | Science and Medicine, visualization, compilers, parallel algorithms, data science, artificial intelligence |
| Sage Mathematical Software System | python 3, python, cython, c/c++ | Science and Medicine, mathematics, toolbox |
| Scala | scala, jvm, llvm | Programming Languages and Development Tools, compilers, programming-tools, functional-programming, programming-language |
| Scilab | c, c++, java, scilab | End User Applications, science, mathematics, numerical computation, graphics |
| ScummVM | c++, opengl, sdl, assembly | End User Applications, games, game engines, software preservation |
| Seastar | cpp, framework, dpdk, tcp, linux | Programming Languages and Development Tools, high performance, tcp, app development, network, framework |
| Software and Computational Systems Lab at LMU Munich | java, python, javascript | Programming Languages and Development Tools, software analysis, software verification, benchmarking, smt solver |
| Space | python, javascript, d3, mysql, mongodb | Science and Medicine, real time, web, data visualization, data analytics |
| SPDX | rdf, python, java, json | Programming Languages and Development Tools, compliance, open source, licensing |
| Stemformatics | python, javascript, postgresql | Science and Medicine, web applications, cloud, bioinformatics |
| STE||AR Group | c++, cuda, opencv, python, boost | Programming Languages and Development Tools, hpc, parallel algorithms, runtime systems, distributed datastructures, asynchronous many task systems |
| Stony Brook University Biomedical Informatics | python, matlab, c++, javascript | Science and Medicine, biomedical data science, cancer informatics, deep learning, medical imaging |
| strace | linux, c, git, shell script, make | Operating Systems, diagnostic, debugging, tracing |
| Streetmix | javascript, react, redux, postgresql, mongodb | End User Applications, smart cities, web, civic tech |
| Submitty | python, c++, databases, web/html/css, php/javascript/ajax | Other, education, privacy/security, data visualization, web |
| Sugar Labs | python, javascript, gtk+ | Other, education, games, user interface, media, stem |
| Sustainable Computing Research Group (SCoRe) | android, java, go, node, pyth | Web, iot, web, mobile, machine learning, security |
| Swift | c++, llvm, cmake, swift | Programming Languages and Development Tools, compilers, programming languages |
| SymPy | python | Science and Medicine, mathematics, computer algebra |
| Systers Community | ios, android, python, ruby on rails, javascript | Other, mobile applications, web apps, community |
| TEAMMATES | java, appengine, javascript | Web, education, teaching, cloud, web applications |
| The Center for Connected Learning and Computer-Based Modeling | javascript, scala, html5/css3 | Programming Languages and Development Tools, simulation, education, programming language, science, academic research |
| The Eclipse Foundation | php, java, xtext, javascript, c/c++ | Other, research, industry, internet of things, runtime systems |
| The Honeynet Project | python 3, python, golang, c/c++, machine learning | Security, honeypots, malware, sandbox, deception, networking |
| The Java Pathfinder Team | java, jvm, android, distributed systems | Programming Languages and Development Tools, program analysis, model checking, symbolic execution, test input generation, formal methods |
| The Libreswan Project | c, python, shell script, qemu | Security, ipsec vpn |
| The Linux Foundation | c, c++, cups, ipp | Operating Systems, kernel, printing, wireless, lsb, spdx |
| The MacPorts Project | tcl, html/javascript, frontend, vue.js, react.js | End User Applications, package manager, mac os x, macos, command line, build tools |
| The Mifos Initiative | java, android, spring, angularjs, mysql | End User Applications, fintech, financial inclusion, mobile banking, digital financial services, microfinance |
| The NetBSD Foundation | c, bsd make | Operating Systems, kernel, userland, unix, packaging, bsd |
| The ns-3 Network Simulator Project | c/c++, python | Other, networking, research and development, network simulation |
| The Processing Foundation | java, javascript, python, android, opengl | Programming Languages and Development Tools, creative coding, graphics, design, education, web |
| The Qt Project | c++11, cpp, qt, qml, opengl | Programming Languages and Development Tools, graphics, gis, maps, declarative language |
| The syslog-ng project. | java, c/c++, big data, elasticsearch, rest | Security, logging, log management, message queue, python |
| The Vega Visualization Tools by the UW Interactive Data Lab | javascript, typescript, react, d3.js | Data and Databases, data visualization, visualization grammar, data science, declarative language, plotting tools |
| The Wine Project | directx, x11, win32, opengl, c | Other, compatibility, desktop integration, 3d, directx, opengl |
| TimVideos.us | fpga, verilog, python, c | Graphics / Video / Audio / Virtual Reality, hardware |
| TLA+ | java, tla+, eclipse, ocaml, smt | Programming Languages and Development Tools, formal methods, algorithms |
| UCSC Xena | javascript, python, clojure, react, jvm | Science and Medicine, bioinformatics, data visualization, web applications, cancer, genomics |
| VideoLAN | c, c++, go, vue.js | Graphics / Video / Audio / Virtual Reality, multimedia, audio, video, 3d, vr |
| ViSP | c/c++ | Graphics / Video / Audio / Virtual Reality, robotics, computer vision |
| vitrivr | java, angularjs, spark, grpc | Data and Databases, retrieval, multimedia, video, audio, 3d |
| webpack | javascript, web development, html5/css3, node.js, webassembly | Programming Languages and Development Tools, tooling, toolchains, compilers, parser, web performance |
| Wikimedia Foundation | php, javascript, ruby on rails, android, reactjs | Web, wikipedia, wikimedia, mediawiki, web, education |
| WorldBrain.io - Verifying the Internet | react, javascript, browser extension, datproject | End User Applications, search, fake-news, decentralization, misinformation, bookmarking |
| X.org Foundation | opengl, vulkan, x11, wayland, opencl | Graphics / Video / Audio / Virtual Reality, graphic stack, 3d acceleration, 2d acceleration, media acceleration, windowing system |
| Xapian Search Engine Library | c++, unicode, swig, linux, golang | Data and Databases, search, information retrieval, machine learning, linguistics, indexing |
| XBMC Foundation | python, c/c++, github, mysql | Graphics / Video / Audio / Virtual Reality, home theater, audio, video |
| Xi Editor Project | rust, swift | End User Applications, text editing, ide |
| xpra.org | python, javascript, compression, remote access, cython | End User Applications, graphics, remote access |
| XWiki | java, javascript, html5, css3, velocity | Web, web development, wiki, platform, web applications, structured data |
| Zulip | python, django, javascript, react native, electron | Social / Communications, web development, team chat, mobile applications, visual design |