Open source. Open possibilities.

Cython is an optimizing Python compiler that translates Python code into C/C++ to create efficient extensions.

Arpege is a top-down bullet hell RPG in a medieval fantasy setting, currently in early development focusing on its engine foundations.

Mosh is a native, cross-platform Digital Audio Workstation (DAW) that integrates AI directly into the signal path, featuring a generative timbre-transform layer and an in-app agent.

ANTLR v4 is a parser generator that reads grammars and produces parsers, parse trees, and listener/visitor interfaces for structured text or binary files. It supports ten target languages including Java, C#, Python3, JavaScript, TypeScript, Go, C++, Swift, Dart, and PHP.

A lightweight C++ game framework using SDL and miniaudio, designed for rapid prototyping with scene management, asset loading, and tick systems.

PGX is an open-source, modular C++ gameplay framework for Unreal Engine 5, designed to unify configuration, extension, and diagnostics.

openage is a volunteer project building a free engine clone of the Genie Engine used by Age of Empires and AoE II. It uses original assets (not shipped), and gameplay is currently non-functional while the simulation is reimplemented. C++20, Python, Qt6, OpenGL, nyan modding format.

A C++ 3D geometry and level workstation for the original Silent Hill (1999) and its unofficial PC decompilation port, supporting bidirectional conversion of proprietary binary formats.

Nakama is an open-source game backend server from Heroic Labs. It provides users, storage, social graph, chat, realtime and turn-based multiplayer, leaderboards, tournaments, parties, purchase validation, notifications and runtime code.

Project Sulla is a C++ logic circuit simulator featuring a GUI for design and a pull-based simulation engine for real-time updates.

LibreSprite is a free and open-source animated sprite editor and pixel art tool, forked from the last GPLv2 commit of Aseprite.

ImHex is a feature-rich, cross-platform hex editor built for reverse engineers, programmers, and anyone doing binary analysis. It offers a custom pattern language, data inspector, diffing, disassembler, YARA scanning, node-based data processing, theming, and plugin support.

Official C++ SDK for LicenseSeat, providing a comprehensive licensing system for games, plugins, and applications with support for online/offline validation and entitlement checking.

APM44 Bridge is a macOS audio bridge that allows producers to run DAW sessions at 44.1 kHz while monitoring through AirPods Max USB-C at 48 kHz.

Official Godot Engine plugin for playing professional 2D animations created with OPTPiX SpriteStudio.

Night Toll is a first-person inspection game inspired by Papers, Please, developed in Unreal Engine 5.7 using C++ for all core gameplay systems.

A curated list of programming tutorials for learning by building real applications from scratch, organized by programming language and covering compilers, kernels, games, web and mobile apps.

Xag is a compiled programming language featuring Rust-style memory ownership, high performance focus, and detailed error messages. It compiles to native code via LLVM or runs through interpreters. Early work-in-progress with strong decimal arithmetic verification against hardware and independent references.

ChakraCore is an open-source JavaScript engine with a C API for embedding JavaScript into C or C++ compatible projects. Originally Microsoft's Edge engine, it is now a community project focused on embedded use cases.

LogSquirl is a fast, open-source log explorer for Windows, macOS, and Linux. Search multi-gigabyte files, follow live logs, and chart patterns. Built with Qt6/C++, it's a fork of klogg and glogg.