Workbox : JavaScript Libraries for adding offline support to web apps.
Parsley.js : Javascript forms validation.
Powerful, UX aware & Dead simple.
Raphaël : Raphaël is a small JavaScript library that should simplify your work with vector graphics on the web. If you want to create your own specific chart or...
Ember.js : A JavaScript framework for creating ambitious web applications
Autotrack : Automatic and enhanced Google Analytics tracking for common user interactions on the web.
A library to generate PDFs in client-side JavaScript.