Stockfish.js (lite, single-threaded), Stockfish 19, used by the GameLake chess game review.
Stockfish is free software under the GNU General Public License v3 (see COPYING.txt).
Engine: https://github.com/official-stockfish/Stockfish
WebAssembly build: https://github.com/nmrugg/stockfish.js (npm package "stockfish", version 19.0.1)
Source of exactly these files: https://www.npmjs.com/package/stockfish/v/19.0.1