The best open source alternative to Jellyfin is Kodi. If that doesn't suit you, our users have ranked more than 25 alternatives to Jellyfin and 17 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Jellyfin are Stremio (Free, Open Source), Universal Media Server (Free, Open Source), Ampache (Free, Open Source) and Video Hub App (Freemium, Open Source).
Media center allowing to watch movies, series, YouTube channels instantly. You can watch in HD, with subtitles, and easily cast any file to TV through DLNA, Chromecast, AppleTV! Stremio also gives you notifications for new episodes / movies.
Universal Media Server is a media server capable of serving videos, audio and images to any DLNA-capable device. It supports any device capable of DLNA and runs on all major operating systems: Windows, OS X and Linux.
Ever had a huge bookshelf full of shows and movies? Ever wanted to digitalize them, but didn't have a good way of organizing the files? Worry no more! Streama is your own personal Netflix for just such a purpose!
Plasma Bigscreen is an open-source user interface for TV's. Running on top of a Linux distribution, Plasma Bigscreen turns your TV or setup-box into a fully hackable device. A big launcher giving you easy access to any installed apps and skills.
PseudoTV Live is channel-surfing for your media center. Never again will you have to actually pick what you want to watch. Use an Electronic Program Guide (EPG) to view what's on or select a show to watch.