Secret Cinema is described as 'Secret-Cinema, previously known as Cinema-Obscure, is a ratio-based movie tracker that specializes in more obscure content, including silent films, classics, arthouse, cult, etc. It falls in the same category as Karagarga and Cinemaggedon' and is a Torrent Tracker in the file sharing category. There are seven alternatives to Secret Cinema, not only websites but also apps for Android, Self-Hosted solutions, Python and Tor. The best alternative is The Pirate Bay, which is free. Other great sites and apps similar to Secret Cinema are BTDigg, Zooqle, Magnetico and Torrent Downloader.
Secret Cinema alternatives are mainly Torrent Search Engines but may also be Torrent Trackers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Secret Cinema.