Tonkatsu Box is a free and open-source media collection manager that lets you organize games, movies, TV shows, anime, manga, visual novels, books, and comics in one place.

It works offline after setup, stores your collection locally, supports direct device-to-device sync over your local network, and can import libraries from Steam, Trakt, MyAnimeList, AniList, RetroAchievements, and more.

The app also includes progress tracking, ratings, wishlists, visual boards, tier lists, and backup/export features without requiring a cloud account.

GitHub: https://github.com/hacan359/tonkatsu_box

More details: https://digitalescapetools.com/tools/tool.html?id=tonkatsubox

More privacy-friendly tools: https://digitalescapetools.com/