… is our answer to JavaScript performance tools that just don't give you the full picture.
… is a cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of health.

If there are problems, DOM Monster will point them out—and even make suggestions on how to fix 'em.

is a compact, modular, Object-Oriented javascript framework designed to make writing extensible and compatible code easier and faster. MooTools lets you get the job done efficiently and effectively.

The ff javascript library is a minimal ( less than 8kb, less than 4kb gzipped ) javascript library that has the following features:

Crossbrowser AJAX, Event and DOM functions offering the same API for w3 DOM compatible browsers and Internet Explorer.
DOM