Tippyjs
Highly customizable vanilla JS tooltip/popover library
Reseter.css
Reseter.css - A Futuristic Alternative To Normalize.css And CSS Resets
State
Hierarchical finite state machine for TypeScript and JavaScript
React Virtualized
React components for efficiently rendering large lists and tabular data
Nested
Gap free multi column grid
Bonzo
library agnostic, extensible DOM utility
Enquire.js
Awesome Media Queries in JavaScript
Scrob Master
Master your scroll events.
Persist State
jQuery Ui widget that will transparently save the state of checkboxes, inputs, selects, etc in localStorage, restoring these on the user's next visit to the page.
Porthole
A proxy to safely communicate to cross-domain iframes in javascript
Html
A simple, extensible way to work directly with the DOM.
Packery
bin-packing layout library
Cortex
A javascript library for centrally managing data with React
Voyeur.js
Voyeur is a tiny (1.2kb) Javascript library that lets you traverse and manipulate the DOM the way it should have been.
Phantomjs
Scriptable Headless WebKit
Keyboard Js
A JavaScript library for binding keyboard combos without the pain of key codes and key combo conflicts.
Eqcss
EQCSS is a plugin that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up