SmartGo is a commercial Go program for Windows available at http://www.smartgo.com. It comes in four flavors:
AndersKierulf: A general purpose tool to enter, replay, annotate, analyze, and study Go games. Full support for SGF, including markups, annotations, and diagrams. Extensive search capabilities.
kungfu: It stikes me that some people may actually be looking for information on .SGF files and run into this page (it happened to me). Those people should go to the smart go format page here at Smart Go Format.
Bette: I have the 9x9 version, and it shows the computer's read ahead. Is there any way to keep it from doing that?
AshleyF: You can turn that off on the View toolbar (see the "Computer lookahead:" section of the help page:
http://www.smartgo.com/HTML/playagainstcomputer.htm). Also, there's the
Lookahead toolbar on which you'll see the think time, positions evaluated, search depth, etc. but I assume what you're talking about the little stones that show up during reading, eh? Hope that helps!