Super simple WYSIWYG editor
AngularJS 1.2+ native directives for Bootstrap 3.
Offline storage, improved. Wraps IndexedDB, WebSQL, or localStorage using a simple but powerful API.
A D3-based reusable chart library
The 1kb client side MV* library
Date/time picker widget based on twitter bootstrap
A positioning engine to make overlays, tooltips and dropdowns better #hubspot-open-source
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
A collection of CSS3 powered hover effects to be applied to links, buttons, logos, SVG, featured images and so on. Easily apply to your own elements, modify or just use for inspiration. Available in CSS, Sass, and LESS.
It's a presentation framework based on the power of CSS3 transforms and transitions in modern browsers and inspired by the idea behind prezi.com.
pushState + ajax = pjax
motion graphics library for the web
Full-sized drag & drop event calendar (jQuery plugin)
Keep multiple browsers & devices in sync when building websites. http://browsersync.io