Capable of creating and editing SGF files. This is the full-featured client to the go server KGS.

• An editor for SGF go files.
• A client for the Kiseido Go Server.

KGS is probably the most user-friendly and full-featured of the online go servers (although not the one with the strongest players). It includes a wide range of go game playing, reviewing, and teaching tools. Most recently, the capability of voice commented lessons was added, along with a pay service including frequent replayable lectures.

License: free

Additional System Requirements: Java runtime environment 1.3 of later