Instafeed.js
A simple Instagram javascript plugin
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.
Flux
Application Architecture for Building User Interfaces
Bower
A package manager for the web, created at Twitter
Boron
A collection of dialog animations with React.js
Popcorn Js
The HTML5 Media Framework
Grid
Drag and drop library for two-dimensional, resizable and responsive lists
Touch Swipe jQuery Plugin
TouchSwipe is a jquery plugin to be used with jQuery on touch input devices such as iPad, iPhone etc.
Ratchet
Prototype iPhone apps with simple HTML, CSS, and JS components.
Plyr
A simple HTML5, YouTube and Vimeo player
Offline
Automatically display online/offline indication to your users. #hubspot-open-source
Leaflet
JavaScript library for mobile-friendly interactive maps
Selectivity
Modular and light-weight selection library for jQuery and Zepto.js
Pep
Pep, a lightweight jQuery plugin for kinetic drag on mobile/desktop
Maybe
Maybe is a type that wraps optional values
Scenejs
An extensible WebGL-based engine for high-detail 3D visualisation