Hi Jack,
There is an article about VR controller-based gesture technology tryout analysis on Unity forum you may be interested in.
Mainly about three VR gesture libraries:
VR Infinite Gesture by Edwon Studio
VR Magic Gestures AI by Raving Bots
VR Gesture and Signature (for HTC Vive) by AirSig
Check it out here.
VR wizard fighting game - Gesture Recognition Tech Comparison
-K