StockFish

Stockfish is a UCI chess engine that is rated the highest among other top engines with >50 ELO points difference in 2019.

I like this repository because it is really impressive that top rated player in a competetive and well researched game like chess is open source and available for anyone to use as they please. It also contains really interesting discussions for both programmers and chess enthusiasts.

Source code is really cleanly written and well documented, even someone not really in to chess can understand the comments made by the developers. Readme file is also really well written. It explains every parameter and how to change each of them. And explains certain design choices and the reasoning behind them.

Link to repository is :https://github.com/official-stockfish/Stockfish