Blender – Realtime VR Viewport (will land in 2.79)
Godot 3.0 support through the Godot-OpenHMD plugin! Available in the asset store.
MassiveEngine by Thorworks.
Showing Reverie Realms: Arena demo.
VR Zero, framework for Raspberry Pi
Safespaces: Arcan based Virtual Desktop for Linux.
Jedi Academy open source implentation with optional OpenHMD support
Visual Molecular Dynamics – academic program using OpenHMD for VR visualisation
Neverball and Neverputt
CaraVR supports Mac OSX and Linux by using OpenHMD as implementation.
