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

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

An open source re-implementation of RollerCoaster Tycoon 2 🎢

AutoHotkey - macro-creation and automation-oriented scripting utility for Windows.

:electron: Build cross-platform desktop apps with JavaScript, HTML, and CSS

Open Source Computer Vision Library

Stellarium is a free GPL software which renders realistic skies in real time with OpenGL. It is available for Linux/Unix, Windows, macOS and Haiku. With Stellarium, you really see what you can see with your eyes, binoculars or a small telescope.

SRS is a simple, high-performance, AI-driven real-time media server supporting RTMP, WebRTC, HLS, HTTP-FLV, HTTP-TS, SRT, MPEG-DASH, and GB28181, with codec support for H.264, H.265, AV1, VP9, AAC, Opus, and G.711.

SumatraPDF reader

Xournal++ is a handwriting notetaking software with PDF annotation support. Written in C++ with GTK3, supporting Linux (e.g. Ubuntu, Debian, Arch, SUSE), macOS and Windows 10. Supports pen input from devices such as Wacom Tablets.

A fast and flexible implementation of Rigid Body Dynamics algorithms and their analytical derivatives

:strawberry: Strawberry Music Player

Nix, the purely functional package manager

Run compilers interactively from your web browser and interact with the assembly

Parsing gigabytes of JSON per second : used by Facebook/Meta Velox, the Node.js runtime, ClickHouse, WatermelonDB, Apache Doris, Milvus, StarRocks

Space exploration, trading, and combat game.

QOwnNotes is a plain-text file notepad and todo-list manager with Markdown support and Nextcloud / ownCloud integration.

Efficient reliable UDP unicast, UDP multicast, and IPC message transport

Bitcoin Core integration/staging tree

A modern formatting library

💻 Desktop sync client for Nextcloud