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OliveChess is a simple chess engine compatible with modern chess interfaces such as ChessBase products, Arena and XBoard/Winboard.
The engine supports UCI and XBoard protocols.
Note: in order to use it as an xboard engine you may need Polyglot tool to be installed first
Braincrack is a chess engine I wrote in my high school time. It is capable of being used with the Winboard protocol and via Winboard->UCI conversion tools within professional chess GUIs like Chessbase.
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.