Il moo davanti a tools dovrebbe far capire facilmente a chi segue queste cose che parliamo di una nuova creazione di Valerio Proietti. Quoto dalla pagina di presentazione di mootools:
mootools is a very compact, modular, Object-Oriented javascript framework. Its unique design makes it extremely crossbrowser, easy to use, and a snap to extend with your own code. It comes with a choice of more than fifteen scripts, plugins and addons, including Effects (moo.fx) Ajax (moo.ajax), Dom Navigator (moo.dom), Drag and Drop, Sortable lists, Cookies Manager and many more. All the previous moo scripts have been made better, reorganized and extended to fully take advantage of the new architecture, even if it retains full compatibility with scripts written prototype-style. One of the big differences is The Element Extension: mootools infact, makes it possible for you to extend HTML elements with your own methods, to make your life easier, and your coding style alot cooler.
Come chiarisce lo stesso Valerio, trattasi di primissima release, lavoro ancora in fieri, con demo e documentazione in arrivo. Per iniziare si può comunque partire da qui.