VeeR VR - Global VR video community
BigScreen VR - Your desktop in virtual reality, with friends; play games, watch movies, and hangout in VR.
WebVR Experiments by Google - Easily build and share VR experiences on the web!
Virtual Desktop - Use your computer in VR
STYLY - Platform for creating VR spaces without any coding
VRidge - Play PC VR games inside your mobile VR headset.