An all-in-one, vr glove with finger tracking for less than £50
Haptic input knob with software-defined endstops and virtual detents
Fusion of gaze and head tracking for fast & accurate hands-free pointing
A 6dof diy hid
Unreal Engine Blueprint & C++ VR interaction functions (pre-configured VR Pawn & Grab/Push/Pull...
An open source VR headset with SteamVR supports for $200