Cpp GitHub Repositories (2026) · Open Source Tools

C/C++ WebRTC network library featuring Data Channels, Media Transport, and WebSockets

Interactive Python & C++ apps for desktop, mobile, and web - powered by Dear ImGui. Stop fighting GUI frameworks. Start building.

Open-source engine for Heroes of Might and Magic III

State-of-the-art virtual machine detection

PLC4X The Industrial IoT adapter

Modern MVVM framework on the C++23 baseline — cross-platform, layered, coroutine-first. Reactive DAG (Property/Computed/Effect), Task<T>, and pluggable adapters (Continuo-powered HTTP).

API and library for MAVLink compatible systems written in C++

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

Extremely fast, in memory, serialization, reflection, and RPC library for C++. JSON, BEVE, BSON, CBOR, CSV, JSONB, MessagePack, TOML, YAML, EETF

A fast & densely stored hashmap and hashset

Halo 2 decompilation (decomp) for the original Xbox: a matching decompilation of the retail game into C/C++ source, rebuilt byte for byte, toward native PC, Linux and handheld ports. Contributors welcome. Source only; bring your own disc.

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.

This is the development repository for the OpenFHE library. The current version is 1.6.1 (released on October 9, 2026).

A C++ header-only HTTP/HTTPS server and client library

Python/C++ library for distribution power system analysis

Windows Calculator: A simple yet powerful calculator that ships with Windows

A modern, cross-platform OpenPGP tool with a unique dual-engine core: switch freely between the battle-tested GnuPG and a modern, memory-safe Rust rPGP backend. It makes encryption, signing, and key management easier and more trustworthy in everyday privacy workflows.

Godot JVM GDExtension. Support Kotlin, Java and Scala.

A modern C++17/C++20 glTF 2.0 library focused on speed, correctness, and usability

ICPP - Run C++ anywhere, just like a script.