TX Library is a tiny graphics library for Win32 written in C++.
Updated emulator of Forgotten Realms: Unlimited Adventures
A cross platform Lua based game engine
Lego Island 2 Game Editor
a game library to develop audio games
Library for creating turn-based games with simultaneous moves.
TurboSphere is an easy to learn and powerful JS based game engine.
NinYawg Adventure
Pear3DEngine is a modern and modular 3D development framework
3D Web UI, Embed Web and Flash in 3D Games, based on WebKit
Cross-platform 2D game engine
Halo Dark Interface es una Interfaz para Halo Custom Edition
A DirectX based graphics/physics engine
An extensible game engine that targets RPGs.