The Tao of Soccer (TOS)  is an open source soccer simulation game, it has a client-server architecture similar to RoboCup soccer simulation , but with a much simplified protocol. It can be played by mouse and keyboard. It's also an AI programming game that can be used for education and fun.

The 3D view is in Java3D. Currently it's very simple. I'm looking for some free nice 3D models in VRML and Xj3D format. Java3D developers are welcome to join the project. Help is needed.

Also for AI developers. if you are interested, write an AI team for TOS.  It's really fun.

http://soccer.sourceforge.net/soccer/