Dynamo.js
Creates dynamic bits of HTML to add some zest to your content
jQuery Tourbus
A jQuery tour/walkthrough plugin.
Vegas
Vegas is a jQuery plugin to add beautiful fullscreen backgrounds to your webpages. It even allows Slideshows.
Tablecloth
A CSS and JS bootstrap to style and manipulate data tables
Readmore.js
A lightweight jQuery plugin for collapsing and expanding long blocks of text with "Read more" and "Close" links.
React Editext
Editable Text Component for React Apps
Optics
Profunctor implementation of Lenses, Prisms, Traversals, Isos, etc.
Offline
Automatically display online/offline indication to your users. #hubspot-open-source
Ng Morphing Modal
Angular Morphing Modal
Im.js
Image Match - Project to allow compare different images pixel by pixel with good performance
Idle.js
Javascript activity library for the browser. (away, idle, etc)
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
Frozen
Frozen is an open-source HTML5 game engine delivering ease-of-use, rapid development through tooling and modularity.
Easy Pie Chart
Lightweight jQuery plugin to render simple, animated and retina ready pie charts with the HTML5 canvas element
Drawingboard.js
A canvas based drawing app that you can integrate easily on your website.
Double
jQuery plugin for hiring doubles
Covervid
Make your HTML5 video behave like a background cover image with this lightweight Javascript plugin / jQuery extension