Since Oculus Rift is kinda expensive, we made a software to play PC VR games on Cardboard type headsets as an entry level for high end VR.
It is a complete Oculus simulation with full head tracking like it is supposed to be.
You can see in the gif how it works. You can try it out at: https://riftcat.com/vridge
Long story short - this lets you play titles meant for Oculus Rift using your phone in a cardboard shell.
Contrast to stuff like Trinus:
Trinus streams active window and translates head rotation into mouse movements. VRidge is complete runtime replacement (oculus runtime is not even required) with low level hooks that emulate Oculus.
Link to reddit thread: https://www.reddit.com/r/oculus/comments/49tpy5/we_made_pc_vr_simulation_on_cardboard_with_head/