Jellyfin

A free app that lets you stream your own media server

Screenshots

Hunter's comment

Another open source application that can be used for media streaming systems and free software is Jellyfin. Making streaming media online using the server managed and set up by your own is truly an advantage and users can have full control of the media they have.

Jellyfin is the Free Software Media System that puts you in control of managing and streaming your media. There are no strings attached, no premium licenses or features, and no hidden agendas. (Source)

The best and coolest part is Jellyfin free software, you own your data and no centralized tracking.

Link

https://jellyfin.github.io/