CGoban
CGoban is the name of three different computer programs written by William Shubert: CGoban, CGoban 2 and CGoban 3. All of them are SGF editors and clients for playing go on-line, but there are important differences between them. For help for the Kiseido-client search sensei's titles for the term 'KGS'.
There is a potential for ambiguity because the names of the two programs are so similar. "CGoban" without a version number usually refers to the first program.
One of the few things that CGoban and CGoban2 have (had?) in common is the use of "Bill's fluorescent green denim" - a green and black striped pattern that he used for background. While professional UI gurus would probably sneer at it, I found it refreshingly idiosyncratic. Recent releases of CGoban2 have had less and less of it; I wonder if Kiseido is exerting editorial control. JohnAspinall