SlipHover is a awesome jQuery plugin to apply direction aware hover animation for the caption of an image.
Flip is a jQuery mobile plugin that give Flipboard app like effect. The Flip effect uses css 3d transform. The effect currently works on WebKit browsers (e.g. Chrome, Safari, including iOS mobile safari) or Firefox 11.
scrollme is a jQuery plugin for adding simple scrolling effects to web pages.
An amazing tutorial to add an animation to your one page scroll websites.
Letter Drop is a jQuery add on for CSS letter drop animation effect. The plugin takes the text string within the defined element and splits each letter out adding a random delay to each from 1.0 to 1.9 secs before dropping and rotating the letters down like rain.