Infuse - Media player and media server with subtitles and wide codec support.
OpenTheatre - Search movies, series, anime, subtitles, torrents and archives from open directories
Universal Media Server - Universal Media Server allows you to host your entire library of video, music, and pictures, and broadcast them conveniently to a wide variety of different devices.
Veso - Veso is an open source media server. An emby/jellyfin fork that will move to a js react framework and focus on remote/rclone mounted media rather than local storage.
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.
Google Home - Set up, manage, and control your Chromecast, Chromecast Audio and Google Home devices.