Pdfmake
Client/server side PDF printing in pure JavaScript
Mojs
motion graphics library for the web
Toastr
Simple javascript toast notifications
Tfjs Core
WebGL-accelerated ML // linear algebra // automatic differentiation for JavaScript.
Parsley.js
Validate your forms, frontend, without writting a single line of javascript!
Konva
Konva.js is an HTML5 Canvas JavaScript framework that extends the 2d context by enabling canvas interactivity for desktop and mobile applications.
Particles.js
A lightweight JavaScript library for creating particles
Typeahead.js
A fast and fully-featured autocomplete library
Riotjs
The 1kb client side MV* library
Q
A tool for making and composing asynchronous promises in JavaScript
Fine Uploader
Multiple file upload plugin with progress-bar, drag-and-drop.
Editor
Next-gen, highly customizable content editor for the browser - based on React and Redux. WYSIWYG on steroids.
Gpu.js
GPU Accelerated JavaScript
Browser Sync
Keep multiple browsers & devices in sync when building websites. http://browsersync.io
Inferno
An extremely fast, React-like JavaScript library for building modern user interfaces
Onsen Ui
Custom Elements-Based HTML5 UI Framework for Building Your Mobile Front End
Zxcvbn
zxcvbn, named after a crappy password, is a JavaScript password strength estimation library. Use it to implement a custom strength bar on a signup form near you!