Goban is a Go board application for Mac OS X. Use it to play Go against various opponents (at this time, only GNU Go is supported).
Features of Goban include:
A simple user interface
Inspectors to view different aspects of the game
Internet Go client
Opens and saves standard SGF files
Supports the Go Modem Protocol and the Go Text Protocol
Simultaneous games are possible
OS X Native... 100% Cocoa, Objective C application
Fix problem when observing IGS games.
Universal Binary (PPC/Intel)
Mac OS X 10.1 or higher
Really terrific Go client - thank you thank you thank you. My only minor quibble is that could be a little more convenient (both in-game and in-channel) - I used to use GoServant, and it's actually a bit more convenient for teaching games and the like. Nonetheless, I love this app. :)
Father(4/4/2005 - version 3.2.4)
Yup, best on any platform. By a loooong way.
Analogue(4/3/2005 - version 3.2.4)
This is the best Go Game for every platform. I miss it on Windows and GNU/Linux