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

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

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.

RPG Maker 2000/2003 and EasyRPG games interpreter

The user-friendly command line shell.

Shōgun

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

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

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

PX4 Autopilot Software

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

PX4 Autopilot Software

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.

Cloud-native high-performance edge/middle/service proxy

Fast and minimalist 3D viewer.

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

Caffe: a fast open framework for deep learning.

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

The continuation of the venerable JA2-Stracciatella project.

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

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

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

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

A free and open-source MMORPG server emulator written in C++

SkyFireEMU is a full featured F/OSS World of Warcraft: Cataclysm emulator written in C++. || Compatible with World of Warcraft client 4.0.6a (Build:13623) || Public DB is located on forum

Abseil Common Libraries (C++)

Image metadata library and tools

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

Pencil2D is an easy, intuitive tool to make 2D hand-drawn animations. Pencil2D is open source and cross-platform.

Helper application for Linux distributions serving as a kind of "entry point" for running and integrating AppImages