Jailed - execute untrusted code with custom permissions
Create objects from reusable, composable behaviors.
window.fetch wrapper for writing simple and expressive requests
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
Checks if the current page is visible or not
A functional js library that facilitates currying and point-free / tacit programming
Micro client-side router inspired by the Express router (~1200 bytes)
A library for adding declarative ajax functionality to your website
jStorage is a simple key/value database to store data on browser side. As a bonus it is also a local pubsub platform to sync data between tabs/windows
History.js gracefully supports the HTML5 History/State APIs (pushState, replaceState, onPopState) in all browsers. Including continued support for data, titles, replaceState. Supports jQuery, MooTools and Prototype. For HTML5 browsers this means that you can modify the URL directly, without needing to use hashes anymore. For HTML4 browsers it will revert back to using the old onhashchange functionality.
A platform for running scripts on many browsers
Peer-to-peer networking with browsers