qGo is a Go client and full featured SGF editor. Go is an ancient boardgame, very common in Japan, China and Korea.
Does NOT work on Mac OS 10.7 "Lion" and Beyond!!!! Another fine toy from the tireless elves at Source Forge dot Net! Go is an ancient boardgame, very common in Japan, China and Korea.
qGo is a Go client and full featured SGF editor, available for Linux/Windows, Solaris, and MacOS X. qGo code is C++/Qt and it's free.
The current version of qGo has a context help included. The online manual is newer than the one included to the released qGo version.
http://qgo.sourceforge.net/