qTip2 – Advanced jQuery Tooltip Plugin

qTip2 plugin can display the tooltip in any position wanted, plays nicely with image maps and they can be set to follow any element (handy for drag 'n' dropped and animated items) or mouse.

QUOjs – Micro JavaScript Library

QuoJS is a micro, modular, Object-Oriented and concise JavaScript Library that simplifies HTML document traversing, event handling, and Ajax interactions for rapid mobile web development. It allows you to write powerful, flexible and cross-browser code with its elegant, well documented, and micro coherent API.