Zig game engine & graphics toolkit
Game engine supporting many 3D/2D formats and graphic effects
A game engine powered by python and panda3d
GemRB is a portable open-source implementation of the Infinity Engine
3D game engine/framework in C, with Luajit and Python bindings now
A Java math library for OpenGL rendering calculations
IsoCity: City building simulation game
An Open Source package that allows video game creators
Fully async, multithreaded, predictive, open source, 3.01 reach
Open and edit the archive files used in over 5700 games.
This software is a particle effect editing tool
Gideros Release version
A modern, cross-platform Quake game engine based on FitzQuake.
Odamex is a free, cross-platform, modern client-server Doom engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
X3D is the open-standard format for 3D graphics scenes on the Web.
Arianne is an engine to develop multiplayer online games like Stendhal
Xj3D is an open-source Java codebase for the X3D Graphics standard.
Virtual X-Ray Imaging Library on GPU
A cross-platform port of Hexen II game.
A free 3d game for PC that does not limit the player. Fight,Build,Gain
Full featured MUD server with all the trimmings.
A fun realistic multiplayer free-and-open-source first-person-shooter!