Huge & Free User Interface Kit For jQuery – jKit
jKit is a free user interface library for jQuery that offers lots of functional features and components.
It works cross-platform and includes slideshow, tabs, accordion, parallax, zoom, tooltip, form handling, ticker and much more.
data-jkit attribute as HTML.
jKit has a very handy “macro” feature that allows defining any custom code (like a tooltip with a specific fading value) that can be used by simply calling the macro’s name.
The UI kit is very well-documented with examples and a cheat sheet exists as well.