What's the best software on windows for managing music, audiobooks and video all in one place?

[Dominic Lobban]

I'm using plex so that I can have access from my phone but it doesn't do a great job at organizing. I need something better

 

[Lutfij]

If you'd like some recommendations here are a few:
http://www.makeuseof.com/tag/5-alternatives-windows-media-center-windows-10/
http://www.digitaltrends.com/computing/best-alternatives-windows-media-center/

Ofc you also have itunes and how to import that library to groove music app

You can also sift through this list:
http://filehippo.com/software/multimedia/players/

of which I'd suggest you look into these:
Mediamonkey
Songbird
Winamp <- a real classic name there
5KPlayer

Hope this helps.