UKI – Simple UI Kit for complex web apps

UKI – Simple UI Kit for complex web apps: "Uki is a fast and simple JavaScript user interface toolkit for desktop-like web applications.
It comes with a rich view-component library ranging from Slider to List and SplitPane."

EYEWITNESS

TransM.js 1.0 allows you to add programmable image transitions to your webpages. Features 113 transitions, 32 tweenings, individual corners, overlay graphics and event actions. Requires no plugin/extension or any other external resource! It uses unobtrusive javascript to keep your code clean.

And check out the demos.