Robert Plummer
The ajax spreadsheet
Tobias Lindig
Calculate the position of an element relative to another element or event. It has also functionality to handle collision within the viewport of a given container. It does not manipulate CSS or DOM, it only calculates values. It is a basic technology to support implementation of tooltips, popups, popovers, scrollspies, sticky navi and many more.
Keith Wood
This plugin attaches a popup calculator to an input field. * Simple or scientific calculators. * Define your own keys. * Over 15 localisations.