History.js
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
Fast Check
Property based testing framework for JavaScript (like QuickCheck) written in TypeScript
Bootstrap Daterangepicker
Date range picker component for Bootstrap
Velocity
Accelerated JavaScript animation.
Zenscroll
A JavaScript module to smooth-scroll web pages and other scrollable elements
Notie.js
A clean and simple notification plugin (alert/growl style) for javascript, with no dependencies.
Validate.js
Lightweight JavaScript form validation library inspired by CodeIgniter.
Parallel.js
Parallel.js is a tiny library for multi-core processing in Javascript.
Montage
Core framework: Montage simplifies the development of rich HTML5 applications by providing modular components, real-time two-way data binding, CommonJS dependency management, and many more conveniences. Join us on irc.freenode.net#montage or https://groups.google.com/d/forum/montagejs
Stacktrace.js
Framework-agnostic, micro-library for getting stack traces in all web browsers
Grunt
Grunt: The JavaScript Task Runner
Embed.js
A jQuery plugin that analyses the string and automatically embeds emojis, media, maps, tweets, code and services.
Chaplin
An Application Architecture Using Backbone.js
Remarkable
Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one.
Request
Simplified HTTP request client.
Jstree
jquery tree plugin
Bricks.js
A blazing fast masonry layout generator for fixed width elements.