DGS is a place where you can play turn-based Go games. It functions more or less the same way as playing Go games via email or postcard would be. You play via a simple web interface: no Java, JavaScript or anything to install. Free.

Play 9x9 Go online with computer programs Jogo and Wally. Uses pure HTML; no Java required.

Play online using Java.

Play Go Online.

Web-based go server with basic features: ability to start, join and watch games of various sizes and options.