ProgressJS will help you to create and manage progress bar for any object on the page. Iranian developer Afshin Mehrabani developed and released it in February 2014. ProgressJS is simple in use and it allows designing your own template for progress bar or even customizing them. View demo here – http://usablica.github.io/progress.js/
Wow.js brings some activity to the otherwise motionless webpages as it reveals CSS animation when you scroll the page down. Wow.js was developed by Vincent LeMoign and Matthieu Aussaguel and works with animate.css. It is smaller than other parallax plugins, very simple to install and the lightweight code is very fast in execution. Demo – http://mynameismatthieu.com/WOW/
Dug.js developed by Rogie King has a simple and lightweight code that will display your dribbble shots, pinterest pins, instagram and 500px photos or even the recently listened music to your website or blog.
Zoomerang.js is a drop-in library that enables the users to zoom in on almost any element in a website. Developed by Evan You and the demo can be seen here – http://yyx990803.github.io/zoomerang/