Poly
Small, fast, awesome. The only ES5-ish set of polyfills (shims) you can mix-and-match because they're individual AMD modules.
Mark.js
JavaScript keyword highlighting. Mark text with options for diacritics, synonyms, custom elements, custom class names, separate word search (multiple terms), filter selectors, accuracy and iframes. Also available as jQuery plugin. Compatible with DataTables.
Big.js
A small, fast JavaScript library for arbitrary-precision decimal arithmetic.
jQuery JSONP
jquery jsonp plugin
Stream Saver.js
StreamSaver writes stream to the filesystem directly asynchronous
Qunit
An easy-to-use JavaScript Unit Testing framework.
Pagerjs
The Single Page Application Framework for KnockoutJS
Benchmark.js
A benchmarking library that works on nearly all JavaScript platforms, supports high-resolution timers, and returns statistically significant results. As used on jsPerf.com.
Audio5js
The HTML5 Audio Compatibility Layer
Intercooler Js
Making AJAX as easy as anchor tags
Svgo
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Js Lingui
🌍📖 A readable, automated, and optimized (5 kb) internationalization for JavaScript
Go Js
All GoJS samples, extensions, and documentation
React Fb Image Grid
A beautifully featured image grid library for React which represents the images just like the facebook grid images with the count for extra as well
Victor
A JavaScript 2D vector class with methods for common vector operations
Buzz
Buzz is a small but powerful Javascript library that allows you to easily take advantage of the new HTML5 audio element. It tries to degrade gracefully on non-modern browsers.
Angular Datepicker
calendar and datepicker directives for angular