I have been using Plex Media Server for a LONG time, it is by any doubt (of my own opinion) the greatest out there. There is also Emby but for my setup it dosent work out very well. PMS also has a DLNA server built in so you would be able to access it via WMP, but its best if you have a browser or want to download the app, get the app even-though it does require you to activate it. But yeah, Plex is great to use as a home media server.