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rapidjson
713 IssuesA fast JSON parser/generator for C++ with both SAX/DOM style API
(tencent/rapidjson)geopm
712 IssuesGlobal Extensible Open Power Manager
(geopm/geopm)bitcoin
696 IssuesBitcoin Core integration/staging tree
(bitcoin/bitcoin)ladybird
665 IssuesTruly independent web browser
(ladybirdbrowser/ladybird)modorganizer
648 IssuesMod manager for various PC games. Discord Server: https://discord.gg/cYwdcxj if you would like to be more involved
(modorganizer2/modorganizer)duckdb
617 IssuesDuckDB is an in-process SQL OLAP Database Management System
(duckdb/duckdb)gdevelop
598 Issues:video_game: GDevelop is an open-source, cross-platform game engine designed to be used by everyone.
(4ian/gdevelop)yosys
596 IssuesYosys Open SYnthesis Suite
(cliffordwolf/yosys)pcl
585 IssuesPoint Cloud Library (PCL)
(pointcloudlibrary/pcl)gnuradio
584 IssuesGNU Radio – the Free and Open Software Radio Ecosystem
(gnuradio/gnuradio)mcserver
579 IssuesA lightweight, fast and extensible game server for Minecraft
(mc-server/mcserver)cuberite
579 IssuesA lightweight, fast and extensible game server for Minecraft
(cuberite/cuberite)warzone2100
575 IssuesWarzone 2100 - a free and open source real time strategy game.
(warzone2100/warzone2100)widelands
572 IssuesWidelands is a free, open source real-time strategy game with singleplayer campaigns and a multiplayer mode. The game was inspired by Settlers II™ (© Bluebyte) but has significantly more variety and depth to it.
(widelands/widelands)x64dbg
568 IssuesAn open-source user mode debugger for Windows. Optimized for reverse engineering and malware analysis.
(x64dbg/x64dbg)fish-shell
551 IssuesThe user-friendly command line shell.
(fish-shell/fish-shell)hhvm
548 IssuesA virtual machine for executing programs written in Hack.
(facebook/hhvm)backgroundmusic
531 IssuesBackground Music, a macOS audio utility: automatically pause your music, set individual apps' volumes and record system audio.
(kyleneideck/backgroundmusic)fritzing-app
501 IssuesFritzing desktop application
(fritzing/fritzing-app)mumble
491 IssuesMumble is an Open Source, low-latency, high quality voice chat software
(mumble-voip/mumble)mediapipe
480 IssuesCross-platform, customizable ML solutions for live and streaming media.
(google/mediapipe)websocketpp
479 IssuesC++ websocket client/server library
(zaphoyd/websocketpp)firmware
478 IssuesMeshtastic device firmware
(meshtastic/firmware)folly
446 IssuesAn open-source C++ library developed and used at Facebook.
(facebook/folly)trafficserver
431 IssuesApache Traffic Server™ is a fast, scalable and extensible HTTP/1.1 and HTTP/2 compliant caching proxy server.
(apache/trafficserver)shogun
423 IssuesShōgun
(shogun-toolbox/shogun)stellarium
418 IssuesStellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows and macOS. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.
(stellarium/stellarium)opensim-core
417 IssuesSimTK OpenSim C++ libraries and command-line applications, and Java/Python wrapping.
(opensim-org/opensim-core)xbmc
404 IssuesKodi is an award-winning free and open source home theater/media center software and entertainment hub for digital media. With its beautiful interface and powerful skinning engine, it's available for Android, BSD, Linux, macOS, iOS, tvOS and Windows.
(xbmc/xbmc)autoware.universe
392 Issueslibzmq
383 IssuesZeroMQ core engine in C++, implements ZMTP/3.1
(zeromq/libzmq)leela-zero
374 IssuesGo engine with no human-provided knowledge, modeled after the AlphaGo Zero paper.
(leela-zero/leela-zero)skia-opengl-emscripten
369 IssuesDEPRECATED! ~~C++ HTML/CSS UI. Supports subset of HTML/CSS. Based on chromium/cobalt.foo without JavaScript overhead. Uses SKIA 2D graphics library. Can be used to build UI for cross-platform app, game or website. Can support browser as HTML5 web framewor
(blockspacer/skia-opengl-emscripten)colobot
366 IssuesSource code of open-source Colobot: Gold Edition project developed by Epsitec and TerranovaTeam
(colobot/colobot)steem
359 IssuesThe blockchain for Smart Media Tokens (SMTs) and decentralized applications.
(steemit/steem)panda3d
344 IssuesPowerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU
(panda3d/panda3d)f3d
342 IssuesFast and minimalist 3D viewer.
(f3d-app/f3d)dxvk
335 IssuesVulkan-based implementation of D3D9, D3D10 and D3D11 for Linux / Wine
(doitsujin/dxvk)launcher
331 IssuesA custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once
(multimc/launcher)sonic-pi
330 IssuesCode. Music. Live.
(sonic-pi-net/sonic-pi)player
328 IssuesRPG Maker 2000/2003 and EasyRPG games interpreter
(easyrpg/player)ethminer
325 IssuesEthereum miner with OpenCL, CUDA and stratum support
(ethereum-mining/ethminer)bgfx
321 IssuesCross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.
(bkaradzic/bgfx)vega-strike-engine-source
313 IssuesDon't fork this project (yet) but work from the original sourceforge subversion repository instead until transitioned.
(vegastrike/vega-strike-engine-source)dsa
288 IssuesData structure and Algorithm (DSA) contributions
(makecontributions/dsa)mgen
279 IssuesMGen: Windows PC C++ algorithmic music generator laboratory, playing into MIDI port and exporting MIDI
(rualark/mgen)natron
278 IssuesOpen-source compositing software. Node-graph based. Similar in functionalities to Adobe After Effects and Nuke by The Foundry.
(natrongithub/natron)lnav
275 IssuesLog file navigator
(tstack/lnav)i2cdevlib
268 IssuesI2C device library collection for AVR/Arduino or other C++-based MCUs
(jrowberg/i2cdevlib)ja2-stracciatella
265 IssuesThe continuation of the venerable JA2-Stracciatella project.
(ja2-stracciatella/ja2-stracciatella)