OpenSCAD - The Programmers Solid 3D CAD Modeller

Thinking notebook and Markdown editor.

The user-friendly command line shell.

An open source re-implementation of RollerCoaster Tycoon 2 🎢

Open Source Routing Machine - C++ backend

lightweight hypervisor SDK written in C++ with support for Windows, Linux and UEFI

World's largest Contributor driven code dataset | Used in Quark Search Engine, @OpenGenus IQ, OpenGenus Visual Project

Bitcoin Core integration/staging tree

Library for using addressable LEDs (such as NeoPixels/WS2812) with Firmata and JohnnyFive

Trust & Safety tools for working together to fight digital harms.

Cyan Worlds's Plasma game engine

PowerDNS Authoritative, PowerDNS Recursor, dnsdist

Flexible level editor

GemRB is a portable open-source implementation of Bioware’s Infinity Engine.

QGIS is a free, open source, cross platform (lin/win/mac) geographical information system (GIS)

Godot Engine – Multi-platform 2D and 3D game engine

Translations editor for Mac, Windows and Unix

This is the Official source code repository of the Synfig project

Hierarchical Engine for Large-scale Infrastructure Co-Simulation (HELICS)

a cross-platform, terminal-based music player, audio engine, metadata indexer, and server in c++