OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

Diablo devolved - magic behind the 1996 computer game

A simple Minecraft clone written in C using modern OpenGL (shaders).

Free software clone of Gunpoint

A console guessing game, written in C#

Animated console version of the 2048 game