UCI chess engine
Sunfish: a Python Chess Engine in 111 lines of code
Chess application whichs allows working with chess PDF books and PGNs.
Bu chess An easy way to play and train chess on your PC
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NetChess to play between two players over net or internet
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Julia chess programming library
Visualizations for machine learning datasets
SJCE - free portable cross-platform graphical chess game, 100% Java.
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An extremely strong chess engine.
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A powerful chess engine written in C++
Port of UCI to Javascript
UCI chess engine
Yet Another Chess ENgine