UCI chess engine
Batch tools for creating Polyglot books and PGN-based statistics.
Tool for chess teachers to create PDF files with chess diagrams in it
Chess training program playing gambits
NetChess to play between two players over net or internet
Python chess engine
EXCEL VBA chess engine with chess board
Extensive Java chess database libraries.
Java Chess Engine
The world's smallest chess playing program just got smaller!
A weak open source java chess engine
Chess engine, currently in development
free open-source chess engine interface
An extremely strong chess engine.
A Chess Engine derived from Winglet
Chess engine
OpenGL chess game
A powerful chess engine written in C++