I use Anilist to track my anime and manga. But haven’t found anything that provides a similar experience in regular movie and TV show tracking, or even books.
For games, there’s a service called Backloggd that uses the IGDb database. For movies, I have used Letterboxd but the Android app is garbage at best.
TMDB (https://www.themoviedb.org/) maybe? Don’t think it has an app though.
A bit late, but keep in mind, TMDB is not FOSS and is owned and run by a private company.