It's a third party remote app for j.River Media Center. I think a lot of Head-Fi users will probably be familiar with jRMC.
j.River themselves do Gizmo, a super ugly and basic Android app as their first-party remote app which has local playback - I used to use it to access my music collection from my phones. I missed having the same thing on WP for a while, but I moved back to Android pretty much full-time some time ago, and only buy/use WP's now to keep up to date. And in terms of streaming my library, I've waved a white flag and thrown up my music library onto Google Music and Match.
I also gave up on jRMC for the development reason I mentioned above - instead of supporting their loyal Windows users properly and moving onto the next-gen W8 stuff, they took the route just to lazily rehash what they were doing, porting it and getting money off OS X users. And even on the Gizmo side not really bother making any changes since the days I was rocking ICS on my Androids.
I was wondering if anyone was using it through WP with nMedium Play and if so what their experiences were. Spotify is still pretty bad on WP, and XBox Music matching is pretty hopeless if my library experiences are anything to go by... so basically, Plex and jRMC/nMedium seem to be the only options available for WP users who want to stream their own libraries instead.
Edited by bangraman - 8/9/14 at 1:42pm