A weak open source java chess engine
A powerful chess engine written in C++
"Kenny" is an XBoard/WinBoard chess engine based on "Winglet"
MOBMAT chess engine
Chess game made with excel-vba
Tyrannus is a Chess GUI and Engine built in Java.
icsdrone is an interface between a chess server and a chess engine
Python chess engine
UCI chess engine
Anni is on free open-source C# UCI bitboard chess engine
ArbyChess is a chess engine that allows arbitrary boards and pieces.
A Java chess engine using xboard protocol
one more chess engine in the barn
A chess application : game with human and/or computer