Help out your favorite open source projects and become a better developer while doing it.

Warzone 2100 - a free and open source real time strategy game.

GNU Radio – the Free and Open Software Radio Ecosystem

Point Cloud Library (PCL)

An open-source user mode debugger for Windows. Optimized for reverse engineering and malware analysis.

A lightweight, fast and extensible game server for Minecraft

A lightweight, fast and extensible game server for Minecraft

The user-friendly command line shell.

Widelands 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.

Yosys Open SYnthesis Suite

A virtual machine for executing programs written in Hack.

Cross-platform, customizable ML solutions for live and streaming media.

Truly independent web browser

Fritzing desktop application

Mumble is an Open Source, low-latency, high quality voice chat software

C++ websocket client/server library

Kodi 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.

An open-source C++ library developed and used at Facebook.

RPG Maker 2000/2003 and EasyRPG games interpreter

Shōgun

SimTK OpenSim C++ libraries and command-line applications, and Java/Python wrapping.

ZeroMQ core engine in C++, implements ZMTP/3.1

PX4 Autopilot Software

PX4 Autopilot Software

Go engine with no human-provided knowledge, modeled after the AlphaGo Zero paper.

DEPRECATED! ~~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

Powerful, mature open-source cross-platform game engine for Python and C++, developed by Disney and CMU

Source code of open-source Colobot: Gold Edition project developed by Epsitec and TerranovaTeam

The blockchain for Smart Media Tokens (SMTs) and decentralized applications.

Don't fork this project (yet) but work from the original sourceforge subversion repository instead until transitioned.

Ethereum miner with OpenCL, CUDA and stratum support

Fast and minimalist 3D viewer.

A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once

Apache Traffic Server™ is a fast, scalable and extensible HTTP/1.1 and HTTP/2 compliant caching proxy server.

Log file navigator

Open-source compositing software. Node-graph based. Similar in functionalities to Adobe After Effects and Nuke by The Foundry.

Data structure and Algorithm (DSA) contributions

Cross-platform, graphics API agnostic, "Bring Your Own Engine/Framework" style rendering library.

The continuation of the venerable JA2-Stracciatella project.

MGen: Windows PC C++ algorithmic music generator laboratory, playing into MIDI port and exporting MIDI

Background Music, a macOS audio utility: automatically pause your music, set individual apps' volumes and record system audio.

I2C device library collection for AVR/Arduino or other C++-based MCUs

libheif is a ISO/IEC 23008-12:2017 HEIF file format decoder and encoder.

Vulkan-based implementation of D3D9, D3D10 and D3D11 for Linux / Wine

Compatible client of Ace of Spades 0.75

Reicast was a multiplatform Sega Dreamcast emulator

Abseil Common Libraries (C++)

A fast and robust web server and application server for Ruby, Python and Node.js

A fast and easy-to-use status bar

OpenToonz - An open-source full-featured 2D animation creation software