TraceKit : Not all browsers support stack traces on error objects, but TraceKit squeezes out as much useful information as possible and normalizes it.
Firebug Lite : A JavaScript file you can insert into your pages to simulate the Firebug console in browsers that are not named Firefox.
AppJS : Build Desktop Applications for Linux, Mac and Windows using HTML, CSS and Javascript
Parsley.js : Javascript forms validation.
Powerful, UX aware & Dead simple.
Anime.js : Anime.js is a fast, multipurpose and lightweight JavaScript animation library with a simple, yet powerful API.
It works with CSS properties, SVG, DOM ...
