Orx: Data-Driven Game Engine
Lumina is a visual game creation environment for building 3D games.
Updated emulator of Forgotten Realms: Unlimited Adventures
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Quake PAK file utility
2D Game Engine
Cross-platform 2D and 3D game engine
Portable game engine with main focus on point-and-click adventures
Single-/multi-player card game Mau Mau (similar to UNO®)
Cross platform Game Creation Software
Gorgon Game Engine (GGE) is a C++ game engine that handles many tasks.
3D Game engine
A game development kit for Sifteo Cubes.
Retro pong clone implemented using sfml
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
cross-platform 2d game engine
A cross-platform OpenGL based lightweight scenegraph library
Delphi-like IDE for cross-platform game development
Cross-platform 2D game engine