Thinking Machine 4 Play chess with an artificial intelligence program on a java interface. It features a spectaculos onboard animation that allows you to see how the software is thinking.
www.turbulence.org/spotlight/thinking
Chess.net Website with meany features that also allows you to play chess online. Paid membership is required.
www.chess.net
GameKnot Online chess comunity where you can play online chess.
www.gameknot.com