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
Hapi
The Simple, Secure Framework Developers Trust
React Virtualized
React components for efficiently rendering large lists and tabular data
jQuery.lazy
A lightweight, fast, feature-rich, powerful and highly configurable delayed content, image and background lazy loading plugin for jQuery & Zepto.
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
jQuery Evergreen
Small & fast DOM and event library for modern browsers.
Do Mtastic
Small & fast DOM and event library for modern browsers.
jQuery.nicescroll
nicescroll plugin for jquery - scrollbars like iphone/ipad
Laconic
Sane DOM Generation
Phantomjs
Scriptable Headless WebKit
Nested
Gap free multi column grid
Cortex
A javascript library for centrally managing data with React
Packery
bin-packing layout library
Dragula
:ok_hand: Drag and drop so simple it hurts
Masonry
Layout elements in a grid, like a mason fitting stones in a wall
Gator
Event delegation in Javascript