Opening Tree Builder

Opening Tree Builder (OTB) lets you build and keep your chess opening
repertoire offline, in a single Polyglot book file that other chess
programs and engines can use too.

- View mode to explore your book, build mode to add every move you play
- Import games from PGN files, filtered by player and color
- One book per color: White, Black or both
- Transpositions are detected and every move order can be shown
- Engine evaluation with the built-in Stockfish
- Autoplay through a line, piece animation, board coordinates