Desktop/Android/HTML5/iOS Java game development framework
Panorama photo stitcher
A multi-purpose emulation framework
SUMO is a microscopic, multi-modal traffic simulation.
Open source, cross-platform compositing software
A modern, cross-platform Quake game engine based on FitzQuake.
A cross-platform port of Hexen II game.
GLScene Engine for Delphi & C++Builder VCL Windows 32/64
A multimedia framework based on Qt and FFmpeg
GemRB is a portable open-source implementation of the Infinity Engine
0 A.D. is a free, open-source, cross-platform real-time strategy game.
The X Jack Video Monitor
ShelXle is a Qt GUI for SHELXL
Retro style, multi-platform soccer game
Game engine supporting many 3D/2D formats and graphic effects