http://www.osvr.org/ Open Source Virtual Reality: OSVR is an open-source software platform for VR and AR. It allows discovery, configuration and operation of hundreds of VR/AR devices and peripherals. OSVR supports multiple game engines, runs on multiple operating systems and provides services in support of low-latency rendering. The OSVR software is provided free under Apache 2.0 license. OSVR is maintained by Sensics and Razer. Built from the ground up to bring the best Virtual Reality gaming experience to the gaming world, OSVR is the one platform where all aspects of the industry – input devices, games, and output – are unified, collaborating and innovating to take Virtual Reality gaming into the next frontier. OSVR Developer Portal download link.