Chess Position Trainer - Lubbe Schach

Catastrophes & Tactics in the Chess Opening - Volume 3: Flank Openings: Winning in 15 Moves or Less: Chess Tactics, Brilliancies & Blunders in the Chess Opening (Winning Quickly at Chess): Hansen

GitHub - davidgma/chess-opening-trainer: Obsolete: Training program to help learn chess openings.

Fundamentals of Chess Openings & Fundamentals of Chess Tactics

Catastrophes & Tactics in the Chess Opening Workbook - Vol 1: Indian Defenses: Tactical puzzles to help exploit opportunities and avoid disasters in (Winning Quickly at Chess Workbook Series): Hansen, Carsten

User Guide Chess Openings Trainer

Chess Openings Trainer Lite for Android - Download

I made an interactive trainer for learning the queens gambit opening, including 86 variations : r/chess

Chess Opening Trainer App Price Intelligence by Qonversion

EP 290- Dutch Trainer and Author IM Jeroen Bosch on How to Build an Opening Repertoire — The Perpetual Chess Podcast

FOXY OPENINGS - VOL 116 - 10 Easy Ways to Get Better