HTC on the Vive VR, powered by SteamVR from Valve headset:

The Vive headset was developed in conjunction with Valve, creators of such ground-breaking games as Portal and Half-Life. HTC manufactures some of the finest consumer electronics on the planet and Valve is an unrivaled architect of virtual worlds, so you know the collaboration is something special. Vive is powered by Valve’s SteamVR so plenty of games that take advantage of its capabilities will soon be available on the Steam service.