Easy communication between cross-origin browser tabs
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.
Like underscore.js, but lazier
onfire.js is a simple events dispatcher subscribe / publish library (< 1kb). async, simple and usefull.
A history service for AngularJS. Undo/redo, that sort of thing. Has nothing to do with the "back" button, unless you want it to.
Message and Error logger implementation
Timeago is a jQuery plugin that makes it easy to support automatically updating fuzzy timestamps (e.g. "4 minutes ago").
A small, fast module and resource loader with dependency management. (AMD, CommonJS Modules/1.1, CSS, HTML, etc.)
window.fetch wrapper for writing simple and expressive requests
A jQuery plugin for creating smart sticky elements
Simple AMD and CommonJS module bundler.