FitText is a very interesting tool, which allows the automatic resizing of a text regarding the size of its parent element. Just have a look to the website and resize your browser: The text will fit. Another very interesting tool for modern websites and applications!
Unsurprisingly, a script that adds pretty ligatures to any kind of text. A must-have for all typography lovers out here!
An asynchronous conditional resource loader that’s super-fast, and allows you to load only the scripts that your users need.
Is a script that helps older browsers to work almost as good as newest ones, so you can build modern applications that will work on IE6 and 7. Your clients will love it, that’s guaranteed.
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more).
Is a website which provides the jQuery documentation in a more user-friendly way, so it is now my reference site when I need any jQuery help.
8. Bookmarklet Generator