From the CGoban1 Sourceforge page:
CGoban1 ("Complete Goban Mark 1") provides a large set of go-related services for Unix and X11. A list of the functions that it provides:
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•Play go against another player. When playing a game locally, you have a choice of rule sets and time controls. I made a strong attempt at implementing the rule sets as precisely as possible:
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•Chinese rules have a true Superko rule.
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•Japanese rules correctly recognize seki and award no points.
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•Japanese rules let you locally resolve disputes at the end of the game.
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•Edit and view SGF files. CGoban provides full functionality for editing and viewing SGF files.
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•Connect to a go server over the internet. CGoban can connect to NNGS or IGS and gives a convienent graphical user interface to the server.
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•Act as a bridge to go modem protocol. Go modem protocol has become a standard way for computer go programs to communicate. CGoban can let you connect to devices (such as modems) speaking go modem protocol, act as a graphical board for programs that speak go modem protocol out of stdin/stdout, or connect programs to one of the internet go servers.