Chico UI – A Free Pack Of jQuery User Interface Components
Chico UI is an open source and free set of user interface components to ease developing with jQuery.
The components include auto-complete, blink, calendar, carousel, countdown, date-picker, dropdown, expando, form and more.
There is a CSS layout framework named Chico Mesh for accomplishing any type of web layouts and grids.
Also, a CSS library exists for styling HTML and UI elements like lists, tables, buttons, typography, pagination.etc..
Each Chico UI resource is well-documented + supported with demos and various tutorials exist for more details.