Wow
Reveal CSS animation as you scroll down a page
Dragula
:ok_hand: Drag and drop so simple it hurts
Voyeur.js
Voyeur is a tiny (1.2kb) Javascript library that lets you traverse and manipulate the DOM the way it should have been.
Cortex
A javascript library for centrally managing data with React
Gliojs
Exit popup easely. Detects if the mouse of a user leaves the viewport borders of your website
jScrollPane
Pretty, customisable, cross browser replacement scrollbars
Responsive Comments
A client-side solution to conditional loading.
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Resize Observer
Polyfills the ResizeObserver API.
Laconic
Sane DOM Generation
Gator
Event delegation in Javascript
Veinjs
Injects CSS into the document (it's a perfectly legal procedure)
React Virtualized
React components for efficiently rendering large lists and tabular data
Phantomjs
Scriptable Headless WebKit
Isotope
An exquisite jQuery plugin for magical layouts. Enables filtering, sorting, and dynamic layouts.
Prefixfree
Break free from CSS prefix hell!
Aurora
Hate Cookies? Introducing Aurora, 100% Cookie-Free Open Website Analytics. Collect Anonymous Data. Make your Audience Happy Now!