Software for studying

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Games of Go on Disk
	Games of Go on Disk (GoGoD) is run by John Fairbairn and T Mark Hall. Its main product, the GoGoD encyclopedia, has a collection of more than 40,000 game records of pro games, in SGF format, John Fairbairn's Go Names Dictionary, tournament data, etc. A great resource for every go player.
Kombilo
	A go database program, including pattern search and search for game properties. Open-source, runs on Windows, Linux and Macintosh OS X.
Drago
	Drago is an SGF viewer/editor which you can also use to work through problems (like uliGo) and to play against GnuGo. Windows. Freeware.
baduK
	A go database program. Open Source, Linux/Windows/Macintosh.
Go Grinder
	GoGrinder is a Java program for practicing go problems. It uses problems in SGF format. 347 problems are included in the install, and thousands more are easily downloadable (pointers in the documentation).
MasterGo
	A go database program, including a pattern search engine, and a collection of around 36,000 games (as of April 2006).
Runyu Studio
	A go database application. Windows. Commercial.
BIgo Software
	A go database program, with a pattern search engine, and (in the full version) a huge amount of games: more than 700,000 pro and top ama games. They also have a joseki database, and OCR software for go diagrams.
uliGo
	This is a program to practice solving go problems. It reads problems in SGF format, and rotates/mirrors them randomly so that in order to answer you really have to know a particular shape, not just one particular position. Free. Linux/Windows/Mac OS X.
GoGameOnline
	Life and death problem software for Palm and other PDA's.
Moyo Go Studio
	A go database program, including a powerful pattern recognition engine, an SGF viewer etc.