Wireframe.cc - Sweet and simple online wireframing tool.
ScrollMagic - The jQuery plugin for magical scroll interactions.
WireframeSketcher - WireframeSketcher is a wireframing tool for creating wireframes, mockups and prototypes for desktop, web and mobile apps. It's a desktop app for Mac, Windows and Linux, and a plug-in for any Eclipse IDE.
Lax.js - Create beautiful & smooth animations when you scroll
Saola Animate - Easily create engaging HTML5 animations and interactive web content without coding skills
ScrollReveal - ScrollReveal is a tool to add scroll animations for web and mobile browsers.