Which software is best to build an opening repertoire and train it?
I tried openings.chessbase.com. The UI is pretty bad, yet it looks like it should have everything I'm looking for. However, I couldn't make it work. It wouldn't load the opening book, the drill feature didn't work at all, etc. . It's just buggy as hell. Just bad. [Edit: Today the drill feature worked and the opening book loaded. So they fixed it for now.]
I read about bookup.com and chesspositiontrainer.com in some old threads, but both seem to be abandoned from their developers since years.
I didn't find anything at chess24.com, chess.com or lichess.org.
Features I'd be looking for:
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