ChessX is an Open Source chess database - new version 1.1.0

How to get the most from ChessBase 16

Chess Opening Database - Chess Forums

Shane's Chess Information Database - Wikipedia

ChessX Flathub

Small Encyclopedia of Chess Openings ABCDE on CD (3rd Edition)

The Outpost Chess and Opening Master Partner to Create Global Chess Community for Players, Coaches, Arbiters, and Clubs

Chess database searches for annotated games (ChessBase Tip #0004)

ChessBase Opening Encyclopedia 2023 - Chess Database Software on DVD

Fritz Powerbook Chess Game Database 2018 - Chess Database Software bundled with Chess Masterpieces CD

How To Use The Opening Explorer - by Nate Solon