openingtree.com now supports variants : r/chess

Diamond Chess Online on the App Store

From 1000 to 2000 ELO, 6 months challenge - Week 1 Update! : r/chess

Different ways to visualize chess openings, what's your favorite? : r/chess

OpeningTree Tutorial

Chess Opening tree plot [oc] : r/chess

ChessMaps

Cultural transmission of move choice in chess Proceedings of the Royal Society B: Biological Sciences

Chess Openings Pro

download PDF - London Chess Centre

Caro-Kann Defense: Good for Beginners and Grandmasters

ChessBase 17 - Premium package

How I use Opening Tree to predict my opponent's opening

ChessBase opening tree statistics