The Net Chess V1.0 supports multi-player to play chess on the Internet. It includes a server application programmed in Java and a chess board Applet. You can use the software to provide online chess game on your web site. The source code is available for you to be able to modify in order to meet your needs for your web site.
Note that this game should be supported by a server on which you must have an authority to run a java application as a server-side program.