Yeah, it's been a year, but this is still a great question!
A free open source 3D player / image viewer - sView
http://www.sview.ru/en has support for 3D Vision, and many other solutions, and can render spherical (equirectangular), and the new gear VR style 18432x1536 cube maps. It was just updated this weekend.
It's a great lightweight piece of software with a lot of features.