TrinusVR is an affordable alternative to dedicated VR systems like Oculus Rift or HTC Vive. It uses a smartphone to deliver the VR content and provide rotation head tracking. Trinus links PC and phone (via USB or Wifi) to deliver high quality graphics. Combined with a Google Cardboard head mount (like the Homido or VR One), it creates an immersive VR experience at a fraction of the cost of other systems. And it available now. As a recent project, there are still improvements to be added, but so far thousands of users have downloaded the app, with a 4.5 star rating on the Android market.