Free jQuery underline Plugins
All the Free jQuery Plugins about 'underline' are listed here.
linkUnderline is a very small jQuery plugin which uses CSS transitions to create animated, configurable, hover-triggered lines under your text on hover.
Hoverline is a tiny jQuery plugin which adds an animated, highly customizable underline decoration to ul li based text links on mouse hover.
Bottline is a minimalist jQuery text decoration plugin that helps add an easy to style bottom line under your text similar to the CSS text-decoration:underline; property.
Slida is a jQuery plugin which allows you to create customizable, sliding underlines for any DOM elements such as a links.