Pressure.js
Force Touch/3D Touch library
Current Browser/Device Support
iPhone 6s (safari)
iPhone 6s Plus (safari)
MacBook 2015 (safari)
13" MacBook Pro 2015 (safari)
15" MacBook Pro 2015 (safari)
Magic Trackpad 2 (safari)
(future devices and browser that support force will be added when they come out)