Fbootstrapp is a toolkit for developing Facebook iframe apps.
It is built on Twitter Bootstrap, has styles for typography, forms, buttons, tables, grids, navigation and much more which are all styled to fit Facebook’s classic design.
The default grid systems provided as part of FBootstrappp are a 760px and a 520px wide 12-column grids. They are a flavor of the popular 960 grid system, but without the additional margin/padding on the left and right sides. And includes JavaScript plugins (provided by the original Bootstrap) that would help providing Facebook-like interactions.
Compatibility: All Major Browsers
Website: http://ckrack.github.com/fbootstrapp/
Download: https://github.com/ckrack/fbootstrapp