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Fairy-Stockfish
chess variant engine supporting Xiangqi, Shogi, Janggi, Makruk, S-Chess, Crazyhouse, Bughouse, and many more
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Oh, apparently an experimental fork of fairy-stockfish with duck chess support was published yesterday! https://github.com/ianfab/Fairy-Stockfish/tree/duck
NOTE:
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Hence, a higher number means a more popular project.