Plex operates a lot like Kodi, minus all the addons.
It's a media player for files you already own (ripped/downloaded DVDs, Blu-rays, music, etc.).
Plex also has its own library of movies available for streaming.
All of this is in the free version.
Plex also allows you to stream your content remotely outside of your home (only if your Home Theater PC or NAS is running).
I don't use this feature and it may only be available in the paid version
Download this to your PC or NAS (wherever your files are located) to get the server set up:
Click here to Download the Plex media server for Windows, Mac, Linux FreeBSD and more free today.
www.plex.tv