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.
Subsonic - Subsonic is a free, web-based media streamer, providing ubiquitous access to your music and video.
Kodi - Kodi is an award winning free and open source media player that got its start on the Xbox console.
Ampache - Web ( HTTP centralized ) based audio/video streaming application
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.
Audio Share - Audio Share can share Windows computer's audio to Android phone over network, so your phone becomes the speaker of computer.