Use Steam VR-enabled applications with your phone as HMD (Head-mounted display). The only Open-Source solution to similar commercial packages like VRidge, iVRy, Trinus etc etc.

The "DIY" SteamVR compatible VR setup made for tinkerers.

DIY VR devices

Annwvyn C++ Open Source designed-for-VR game engine and application developement framework

SteamVR driver for TrueOpenVR

Play SteamVR enabled games with your phone as an HMD

uVR Model template project

A demo scene to integrate and show a DIY HMD in action using ogre3d