You can make it - Open Source MMORPG Platform
Arianne is an engine to develop multiplayer online games like Stendhal
Game engine supporting many 3D/2D formats and graphic effects
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Example code for creating a 2D platform game in Java.
Single-/multi-player card game Mau Mau (similar to UNO®)
Built to be ease of use, with no programming knowledge, Multi-platform
Cross platform Game Creation Software
Gives agents personality, moods, emotions and emotional attachments.
Read and write PGN format and test moves for legality.