Razer doesn't get mentioned because their product is not very good. OSVR is their proprietary API, and its an "open" standard in the same way OpenVR is. OpenX

Razer doesn't get mentioned because their product is not very good. OSVR is their proprietary API, and its an "open" standard in the same way OpenVR is. OpenXR, the Khronos standard for VR/AR/MR devices will be the industry standard API equivalent to OpenGL, but even OpenVR (Vive/SteamVR api) is a better option than OSVR currently.