Spin.js is an imageless activity / loading indicator. The library gives you fine control over your indicator's look and at 3K minified (1.7K gzipped) it is smaller than most similar animated GIFs. Spin.js is completely stand-alone and works with Chrome, Safari 4+, Firefox...

Isotope is a jQuery plugin for sorting and filtering elements using smart layouts that adjust to the browser real-estate - from huge displays to small mobiles. Elements animate as they rearrange either when sorting, filtering or when the browser is resized or zoomed...

Raphaël is a small JavaScript library that will simplify your work with vector graphics on the web.Raphaël uses the SVG W3C Recommendation and VML as a base for creating graphics and currently supports Firefox 3.0+, Safari 3.0+, Opera 9.5+ and Internet Explorer 6.0+.Check...

Here's a great animation library written in JQuery. www.spritely.net works with IE6+ and most over browsers including iPhones and iPads and is great if you want to build animations that run without the need for a Flash plugin. You can animate sprites and backgrounds...