Zebra_TransForm is a tiny (3KB minified) jQuery plugin for styling the appearance of checkboxes, radio buttons, and select boxes without sacrificing functionality and accessibility: the elements preserve their tabindex order, give visual feedback when having the focus, can be accessed by using the keyboard, and look and behave in the same way in all major browsers. It degrades gracefully in IE6.
jQuery Calx is powerful yet easy to use jQuery plugin for building calculation forms or calculation tables. It parses provided formulae and performs calculations, scans for form changes and updates results automatically, and formats plain numbers into currency format, ordinal numbers, etc. It is suitable for both simple ($A+$B) formulae and complex ones such as ($I*$P*((1 + $I)^$N)) / (1 - ((1 + $I)^$N)).