Free, open source game engine online
Ct.js is a desktop game engine that makes learning programming fun
The Tiny JavaScript Game Engine That Can!
A national virtual bridge engineering contest for kids of all ages.
Cerberus Content Management System
A JavaScript game library to quickly develop board games for the web
Massively multiplayer online game server and client framework
Android, DOS, FirefoxOS, Linux, MacOS and Windows all in one..
Built to be ease of use, with no programming knowledge, Multi-platform
Free open source game created in Unity 3d for Windows 64 bits
An extensible development framework for roleplay games.