A lightweight library of for easing based on Penner's easing equations.
Robert Penner's easing functions, slightly modified
Abstracted functional easing provider, based on Penner's equations.
grab bag of easing equations
Robert Penner's easing functions
Penner (Easing) functions in ES6
Penner easing functions for node
easing equations available as CDN from unpkg.com/eases-cdn/