Supertux

Open-source clone of the original X-Com

A free and open-source Touhou Project fangame

Dust Racing 2D is a traditional top-down car racing game including a level editor.

Clone of the Age of Empires II engine

Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.

Space exploration, trading, and combat game.