C++

Protocol Buffers - Google's data interchange format

Official source code of FreeCAD, a free and opensource multiplatform 3D parametric modeler.

A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch)

Atmosphère is a work-in-progress customized firmware for the Nintendo Switch.

Audio Editor

Apache Arrow is the universal columnar format and multi-language toolbox for fast data interchange and in-memory analytics

A VPN client for creating private VPN servers with censorship-resistant protocols

Very low latency speech to text, intent recognition, and text to speech, for building voice agents and interfaces

A Hardware Hacking Tool with Web-Based CLI That Speaks Every Protocol

Tool for automatic PS5 executables porting to Linux and Windows