chesslair

ChessLair is a private workspace for building your chess opening repertoire, and drilling them when needed.

You can:

Create openings and organize them into groups and folders
Save variations
Add comments to specific moves
Quiz openings, folders, or groups
Play through your prep like a study session
Check ideas with Stockfish
Use analytics to see thin lines, recent updates, color split, and repertoire depth
It is free to use, with a Pro plan for bigger limits.