Mag.js
MagJS - Modular Application Glue
Egjs Infinitegrid
A module used to arrange card elements including content infinitely on a grid layout.
Resize Observer
Polyfills the ResizeObserver API.
Eqcss
EQCSS is a plugin that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up
Tether
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
Design Blocks
A set of 170+ Bootstrap based design blocks ready to be used to create clean modern websites.
Tapestry5 jQuery
Tapestry 5 jQuery integration. Fully replace Prototype and Scriptaculous with jQuery with as less as possible compatibility issues
Hapi
The Simple, Secure Framework Developers Trust
React Virtualized
React components for efficiently rendering large lists and tabular data
Sizzle
A sizzlin' hot selector engine.
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Tire
Tire is a lightweight JavaScript library for modern browsers
Dragula
:ok_hand: Drag and drop so simple it hurts
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Do Mtastic
Small & fast DOM and event library for modern browsers.
Laconic
Sane DOM Generation
Phantomjs
Scriptable Headless WebKit