BuilderX - Design to code, designers and developers on one platform.
Lax.js - Create beautiful & smooth animations when you scroll
Unheap - A nice repository of jQuery plugins
ScrollMagic - The jQuery plugin for magical scroll interactions.
WOW.js - Animate elements on-scroll to catch attention. Such Magic.
Visage - Visage is a new platform that enables non-designers to easily create beautiful, on-brand visual content such as data visualization, reports & much more