UCI chess engine
Sunfish: a Python Chess Engine in 111 lines of code
Play chess from your terminal
Portable UCI- and XBoard-compatible chess engines.
Chess Database and PGN viewer
NetChess to play between two players over net or internet
a UCI chess engine
Chess program
SJCE - free portable cross-platform graphical chess game, 100% Java.
Chess for the Blind for the JAWS or NVDA Screen Readers
MOBMAT chess engine
Java Chess Engine
A fast bot for chess.com
Chess engine
An extremely strong chess engine.
A powerful chess engine written in C++
Port of UCI to Javascript
Chess engine
UCI chess engine
Yet Another Chess ENgine
3D OpenGL Chess - C++
Anni is on free open-source C# UCI bitboard chess engine