Stockfish 15 is now available

• books

  7 144 4.6 Python

  Chess books used to develop Stockfish (by official-stockfish)

  

You mean this? These are not opening books, though they're called "books". They're PGNs with starting positions, usually a couple of moves into the game, that are used for statistical tests as having engines play from the regular starting position does not sweep the space of realistic game positions very well.

• fishtest

  23 255 9.1 Python

  The Stockfish testing framework

  

In https://github.com/glinscott/fishtest/wiki/Regression-Tests you can see 8moves_v3.pgn opening book (09/11/2013 - current) with a link:

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• Stockfish

  150 10,498 9.6 C++

  A free and strong UCI chess engine

  

You could also consider compiling stockfish your self, it's one of the simplest programs out there as far as self compiling on linux is concerned. Quoting from the stockfish readme, something like mkdir ~/stockfish-src && cd ~/stockfish-src && git clone https://github.com/official-stockfish/Stockfish.git . && cd src && make build ARCH=x86-64-modern ought to do the trick. That would also keep you up to date with elo gainers between releases.

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