CGoban (the name means "complete goban") is a
free SGF editor and
go client written by William Shubert. It is sometimes called "CGoban
1" to distinguish it from CGoban 2, which is a different program
written later by the same author.
CGoban allows on-line play on IGS, NNGS and other servers that use a compatible protocol.
William Shubert no longer maintains CGoban. Its original web page is
at http://www.igoweb.org/~wms/comp/cgoban/. The program now has new
maintainers and a new web site at
http://cgoban1.sourceforge.net/.
Edgar Toernig is also still working on CGoban 1. His patch against William's last version (1.9.12) fixes a couple of bugs and adds some new features (
ChangeLog).