SDL based generic 2D game engine
Odamex is a free, cross-platform, modern client-server Doom engine
A WIP of a very cool game engine
Amateur 3D Game Engine
Knema is a lightweight real-time performance & frame continuity engine
Arianne is an engine to develop multiplayer online games like Stendhal
Old-school 2D game engine
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
0 A.D. is a free, open-source, cross-platform real-time strategy game.
maXbox is a script tool engine, compiler and source lib all in one exe
DolphinOS Releases
A free transportation simulator game
The Ultimate Automation Assistant
computer opponent for the board game Blokus
3D puzzle game based on Kula World and Cubosphere
BookWorm-Cheat Engine
Create and Publish Games to Sell in one Place
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
A cross-platform port of Hexen II game.
Lightweight, high-performance HTML renderer for game developers
Full featured MUD server with all the trimmings.