Bluebird is a full featured promise library with unmatched performance.
Promise based HTTP client for the browser and node.js
The streaming build system
A modern, HTML5-ready alternative to CSS resets (as used by Twitter Bootstrap, HTML5 Boilerplate, TweetDeck, Soundcloud, and many others).
Simplified HTTP request client.
the last carousel you'll ever need
A datepicker for @twitter bootstrap forked from Stefan Petre's (of eyecon.ro), improvements by @eternicode
Sentry is a realtime error logging and aggregation platform
File Upload widget with multiple file selection, drag&drop support, progress bars and preview images for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image resizing. Works with any server-side platform (PHP, Python, Ruby on Rails, Java, Node.js, Go etc.) that supports standard HTML form file uploads.
Scriptable Headless WebKit
An alternative to Underscore.js, delivering consistency, customization, performance, and extra features.
The official jQuery user interface library.
Jade - robust, elegant, feature rich template engine for nodejs