Alertigo is a very small (~2kb unminified) jQuery plugin to display stacked, sticky (or auto-dismissable), and growl style alert messages at the bottom of the screen.
AutoTextColor is a jQuery plugin for automatic text coloring that automatically inverts the color of the text depending on the background of its parent container.
Radiocharm is a jQuery plugin to enhance & beautify the regular radio button that allows custom labels, icons, styles for each status of (un)checked inputs.