Internet Go Server:Play go online using the IGS protocol with a client or by telnet. Popular and usually busy.
Cyberoro: English page for Korean Go server. Need to download client.
Dash & Dot Baduk: English home page of Korean/English language Go (Baduk in Korean) server. Need to download client to play.
Free Internet Correspondence Chess and Go Server: A free server for correspondence Go and Chess.
Kiseido Go Server: Server for reviewing games with an opponent, accessible with a client or online using Java.
World-Wide Internet Gokaisho: Go server based in Japan. Play via telnet or a client, or with java on the web.