Dicehunter
Resident Newb
So apparently the Index, Vive and Vive Pro have had finger tracking available all along using their built in cameras, It's only now been enabled in a free VR game called Neos available on Steam.
https://store.steampowered.com/newshub/app/740250/view/2873815014878625258/
https://store.steampowered.com/newshub/app/740250/view/2873815014878625258/