Magic
CSS3 Animations with special effects
ES5 Shims
ECMAScript 5 compatibility shims for legacy JavaScript engines
Mailcheck
Email domain spelling suggester
Stats.js
JavaScript Performance Monitor
Dicebear
DiceBear is an avatar library for designers and developers.
Vex
A modern dialog library which is highly configurable and easy to style. #hubspot-open-source
Hello.js
A Javascript RESTFUL API library for connecting with OAuth2 services, such as Google+ API, Facebook Graph and Windows Live Connect
LZ String
LZ-based compression algorithm for JavaScript
G2 Plot
:dango: An interactive and responsive charting library
Framer
Modern Prototyping Tool
Loki JS
javascript embedded / in-memory database
Lightgallery.js
Full featured javascript lightbox gallery. No dependencies.
Metrics Graphics
A library optimized for concise, principled data graphics and layouts.
Remarkable
Markdown parser, done right. Commonmark support, extensions, syntax plugins, high speed - all in one.
Jquery Transit
Super-smooth CSS3 transformations and transitions for jQuery
Jquery Timeago
Timeago is a jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").
Heatmap.js
JavaScript Library for HTML5 canvas based heatmaps