Open Source Virtual Reality Group Releases HDK to VR Developers | App Developer Magazine
Component kit "SteamVR Tracking HDK" for 3D tracking system hardware development | TEGAKARI, an information transmission medium for research and development
OSVR's HDK VR Headset Gets Upgraded - Adds 1080p OLED, Video Mirroring and 'Evaluation' Positional Tracking – Road to VR