Prototype : Easy Ajax and DOM manipulation for dynamic web applications
DOM Monster Bookmarklet : DOM Monster 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 ...
PouchDB : PouchDB is a JavaScript library that allows you to store and query data for web applications that need to work offline, and sync with an online databa...
domsnitch : A passive reconnaissance tool inside the DOM (experimental)
DOM Storage Query Language (DomSQL) is an SQL inspired interface for DOM Storage (or Web Storage as defined in the W3C working draft).