Displays ratings from IMDb, Rotten Tomatoes, Metacritic, MyAnimeList, AniList, and CinemaScore (when available).
Several other features, but thought I’d put this out there for those who haven’t used it. Very handy for us data nerds. It’s been an active plugin for two years now, and I’ve been using it for about a year myself.
As a Letterboxd user, looks really useful, thanks for linking!