VR Infinite Gesture is an open source gesture recognition plugin for VR and Unity3D (specifically 2 handed 6dof controlled VR i.e. Vive and Oculus Touch).
Documentation is available at: http://edwonstudio.com/vr-gesture
VR Infinite Gesture is also available on the Unity Asset Store for a modest price. If you find this project beneficial, please consider supporting its ongoing development. You'll have the convenience of easy installation and updates right from the Unity Editor.