Preloader.js is a jQuery plugin to create YouTube like progress bar for your website. It's simple, fast and customizable.
LoadGo is a jQuery plugin that allows you to create a progress bar by using your own images.
ToProgress is a lightweight, no-dependency top progress bar library.
A tutorial on how to write a CSS3 progress bar and add some cool animation, along with a jQuery counter.
Fort.js is a modern progress bar for form completion. All you do is add the form and Fort.js algorithm will take care of the rest.
ClassyLoader is a jQuery plugin that lets your add beautiful and animated loaders to your website.
Pace makes a beautiful progress indicator for your page load and ajax navigation.
It will automatically monitor your ajax requests, event loop lag, document ready state, and elements on your page to decide the progress. On ajax navigation it will begin again!