ua-parser-js
Detect Browser, Engine, OS, CPU, and Device type/model from User-Agent & Client Hints data. Supports browser & node.js environment
magnific-popup
Lightbox and modal dialog plugin. Can display inline HTML, iframes (YouTube video, Vimeo, Google Maps), or an image gallery. Animation effects are added with CSS3 transitions. For jQuery or Zepto.
urijs
URI.js is a Javascript library for working with URLs.
jsrender
Best-of-breed templating in browser or on Node.js (with Express 4, Hapi and Browserify integration)
jquery-mockjax
The jQuery Mockjax Plugin provides a simple and extremely flexible interface for mocking or simulating ajax requests and responses.