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"Shane's Chess Information Database" is a huge chess toolkit with extensive database, analysis and chess-playing features.
Scid vs. PC is a usability and bug-fix fork of Scid. It has many interface fixes and improvements, and is fully compatible with Scid's .si4 databases. New features include a rewritten Gamelist, Computer Tournament, and FICS, Tree, Book and Graph improvements.
C/CIF is an interchange format for chess applications. This format is supporting all features of a chess application - PGN does not provide this - and can be used to transfer chess archives without any loss via an application independent format.
C/CIF is supporting two formats: the binary format CCIF, and the human readable format CIF (in XML).
Quasimodo is a chess interface for playing chess games against other humans or chess engines, analyzing chess games, managing chess databases and playing games over the internet (on Free Chess Internet Server).
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baduK is a pattern analysis and search engine for the game of Go/Baduk/Weiqi. An ancient boardgame common in Japan, Korea, China and Taiwan. Features multiple databases, game previews and instant pattern matches. Developed using C++ and Qt 4.1.4
Foobase is intended to be a simple replacement for entering/viewing games of chess in chessbase databases. In the future, other database formats may be supported as well.