A nice collection of CSS-based loading indicators

SpinKit from GitHub’s Tobias Ahlin uses CSS animations to create smooth and easily customizable animations, but look out if you need to support older browsers:

The goal is not to offer a solution that works in every browser—if you're supporting browsers that haven't implemented the CSS animation property (e.g. IE9 and below), you'll want to detect support for the animation property, and implement a fallback

The demo features 8 different styles for you to pick from. #6 is pretty rad if you can find a good use case for it. Check ’em out!