Third-person Survival Game for Unreal Engine 4.
Warzone 2100 - a free and open source real time strategy game.
An open source re-implementation of RollerCoaster Tycoon 2 🎢
Open-source clone of the original X-Com 👽
Free (as in freedom) open source clone of the Age of Empires II engine 🚀
SuperTux source code
Cataclysm - Dark Days Ahead. A turn-based survival game set in a post-apocalyptic world.
Compatible client of Ace of Spades 0.75