I own an ES7500 and haven't been able to find a suitable alternative to Plex using my Mac. Apparently Samsung doesn't support direct DLNA with Media share in a Mac environment. I've tried Serviio and it just doesn't compare.
Apparently Plex is working on an App version for the Smart hub for the newer models but it hasn't been released yet.
We have a Samsung PN60E550 and my wife just now connected her 2009 Macbook Pro and iPad 2 to it. She got a program from the app store called Samsung TV HD and it automatically connected. A box popped right up on the Samsung asking if I wanted to allow the connection and away it went. She's looking for PLEX now. She just found it, but it's pay, so she didn't want to get it or anything. We have PLEX on our Roku through my laptop, but it's Windows.