Ember.js : A JavaScript framework for creating ambitious web applications
Parsley.js : Javascript forms validation.
Powerful, UX aware & Dead simple.
Head JS : Load scripts like images. Use HTML5 and CSS3 safely. Target CSS for different screens, paths, states and browsers. Make it the only script in your HEA...
loglevel : Minimal lightweight logging for JavaScript, adding reliable log level methods to wrap any available console.log methods
Add Clippy or his friends to any website for instant nostalgia.