Xash3D FWGS engine
Rcon client for Minecraft
The ioquake3 community effort to continue supporting/developing id's
A free/open source client and automation tool for Ragnarok Online
Classic overhead run-and-gun game
The flexible game engine
A free and open-source Touhou Project fangame
An OpenGL RTS game engine written in C
Go bindings for raylib, a simple and easy-to-use library
Gideros Release version
RTS game with the theme of Strategy by Design
0 A.D. is a free, open-source, cross-platform real-time strategy game.
A modern, cross-platform Quake game engine based on FitzQuake.
A cross-platform port of Hexen II game.
Cross-platform real-time strategy game (3D)
INSTEAD - Simple Text Adventure Interpreter.
A completely free, open-source, 2D game engine
A cross-platform, multimedia interpreter for TADS adventure games.
A cross-platform, open-source, pure C game engine for mobile game
Retro game engine for creating games like it's 1997
A C library for decoding .smk Smacker Video files
Cross-platform 2D and 3D game engine
It is a Brick breaking game with lots of cool features.