Godot Engine – Multi-platform 2D and 3D game engine

C++ DataFrame for statistical, Financial, and ML analysis -- in modern C++ using native types and contiguous memory storage

Protothread.h, a C++ port of Adam Dunkels' protothreads library

C23 Checked Arithmetic

C Mock is Google Mock's extension allowing a function mocking.

Modified version of Fixed Point Math Library for C

Random C++ helpers and utilities