Chess Engines: A Zero to One (chessengines.org)
This a guide on how to build a Chess engine from scratch, updated periodically as I further explore the space. This assumes some basic knowledge of Chess, search algorithms, and coding.
(JavaScript, GoLang)
0hq/chess-ai: Chess engine written in Javascript.
some alternatives:
notnil/chess: chess package for go @GitHub (MIT)
Chess Engine : markus7800/Beth: Chess engine written in JULIA.