OnionShare
Jellyfin - The Free Software Media System
Source-code: https://github.com/jellyfin/jellyfin
Plex.tv - Stream movies and TV shows
Plex is a one stop destination to stream movies, tv shows, sports & music. Check good movies to watch on Plex and stream all your personal media libraries on every device.
Stremio - Freedom to Stream
Source-code: https://github.com/stremio Fork: https://github.com/Zaarrg/stremio-community-v5
Emby - The open media solution
media server for personal streaming videos tv music photos in mobile app or browser for all devices android iOS windows phone appletv androidtv smarttv and dlna
Piwigo