jQ.Mobi is a fresh and open source JavaScript framework that focuses on providing a great experience on both of the dominant mobile operating systems with a tiny footprint and code efficiency.
Really Simple Slideshow is a jQuery plugin for creating image sliders of any kind. Plugin converts any list of images into a slideshow, it can display captions with each slide, include links and there are multiple transition effects.
Adaptor is a jQuery image slider that offers slick 2D and 3D transitions. 3D effects, if done smoothly, usually looks very good on the web as it is still unexpected for most to see anything that is not 2D online.
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.