C Plus Plus GitHub Repositories (2026) · Open Source Tools

🛡 I2P: End-to-End encrypted and anonymous Internet

WinMerge is an Open Source differencing and merging tool for Windows. WinMerge can compare both folders and files, presenting differences in a visual text format that is easy to understand and handle.

QtPass is a multi-platform GUI for pass, the standard unix password manager.

Static reflection for enums (to string, from string, iteration) for modern C++, work with any enum type without any macro or boilerplate code

OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

An audio server, programming language, and IDE for sound synthesis and algorithmic composition.

Open-source engine for Heroes of Might and Magic III

Modern C++20 GNSS toolkit — RTK/PPP/CLAS/IMU fusion.

Optimizer and compiler/toolchain library for WebAssembly

Infinite space, infinite zoom, collaborative canvas program for massive sketches and notes

Open Babel is a chemical toolbox designed to speak the many languages of chemical data.

A fast & densely stored hashmap and hashset

A multi core friendly rigid body physics and collision detection library. Written in C++. Suitable for games and VR applications. Used by Horizon Forbidden West and Death Stranding 2.

Q Light Controller Plus (QLC+) is a free and cross-platform software to control DMX or analog lighting systems like moving heads, dimmers, scanners etc. This project is a fork of the great QLC project written by Heikki Junnila that aims to continue the QLC development and to introduce new features.

Cryptography Toolkit

Cross-Platform Level Editor

... the open-source glide computer

Decentralized cryptocurrency blockchain daemon implementing the XRP Ledger protocol in C++

:tangerine: Clementine Music Player

C++ Library for Audio Digital Signal Processing