BiGo Assistant
BiGo Assistant is Go (Baduk, Weiqi) games (professional and amateur) database software. It allows searching by fuseki, joseki, positions and game information fields.
Go2000
A full featured Go database management system with pattern matching and classification.
GoTools: The Tsume-Go Program
Tools for learning life and death situations, including a huge database of problems, and several interactive modes.
Kombilo
A free database program for game collections in SGF format. It includes search function for patterns, positions and game information.