Chess-Brabo: Chess position trainer

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Best 5 free Chess Software - Chess Forums

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

Chess Position Trainer

Fundamentals of Chess Openings & Fundamentals of Chess Tactics

Chess Openings Trainer by Piero Toffanin

chessblogger: Chess Position Trainer 4 – Public Beta is out

Chess Openings Trainer Lite for Android - Download

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

Perfect Chess Trainer 1.64.1 Free Download