Pace
Automatically add a progress bar to your site. #hubspot-open-source
Sigma
An open-source lightweight JavaScript graph drawing library
Backbone Marionette
Make your Backbone.js apps dance with a composite application architecture!
Lowdb
An extendable JSON database for Node and the browser powered by lodash
Cytoscape.js
A JavaScript graph library for analysis and visualisation (compatible with CommonJS/Node.js, AMD/Require.js, jQuery 1.4+, Bower, npm, and plain JavaScript)
Vivus
JavaScript library to make drawing animation on SVG
Loaders.css
Delightful, performance-focused pure css loading animations.
Editor
Next-gen, highly customizable content editor for the browser - based on React and Redux. WYSIWYG on steroids.
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!
Easel JS
The Easel Javascript library provides a full, hierarchical display list, a core interaction model, and helper classes to make working with the HTML5 Canvas element much easier.
Wow
Reveal CSS animation as you scroll down a page
Interact.js
Drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE8+)
Rxdb
:computer: :iphone: A reactive Database for Progressive Web Apps and more
Tether
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
List
Do you want a 3 KB (gzipped&minified) cross-browser native JavaScript that makes your plain HTML lists and tables super flexible, searchable, sortable and filterable? Yeah! Do you also want the possibility to add, edit and remove items by dead simple templating? Hell yeah!
Fuse
Lightweight fuzzy-search, in JavaScript