Gridster is a jQuery plugin that makes building intuitive draggable layouts from elements spanning multiple columns. You can even dynamically add and remove elements from the grid.
More at http://gridster.net/.
Gridster is not currently being actively maintained by Ducksboard.
I and others have been given access to the repo to help maintain and address issues.
I have created a fork of gridster that supports more advanced features, like widget-swapping and static widgets.
It can be found here: https://github.com/dustmoo/gridster.js
Currently the code-base is different and I don't have time to reconcile the fork with this repo.
If anyone would like to help me improve my fork and reconcile it with the main library I would be happy for the help.
Distributed under the MIT license.
Gridster is built by Ducksboard.