こんなに

結構あるもんだ。

Prototype.js	http://prototype.conio.net/	Prototype is a JavaScript framework that aims to ease development of dynamic web applications. Featuring a unique, easy-to-use toolkit for class-driven development and the nicest Ajax library around, Prototype is quickly becoming the codebase of choice for web application developers everywhere.
JQuery	http://jquery.com/	「writing javascript code should be fun」がコンセプト
AFLAX	http://www.aflax.org/	AFLAXtm (Wikipedia Entry) stands for Asynchronous Flash and XML. Defined simply, AFLAX is a development methodology which combines Ajax and Flash to create more dynamic web based applications.
MochiKit	http://www.mochikit.com/	MochiKit is a highly documented and well tested, suite of JavaScript libraries that will help you get shit done, fast. We took all the good ideas we could find from our Python, Objective-C, etc. experience and adapted it to the crazy world of JavaScript.
Rico	http://openrico.org/	for creating rich internet applications. full support for ajax dnd management and cinematic effects library
Behaviour.js	http://www.ripcord.co.nz/behaviour/	Behaviour, a cool mechanism for cleaning up your HTML
Dojo	http://dojotoolkit.org/	open source make professional web development better,easier, faster
Scriptaculous	http://script.aculo.us/	provides you with easy-to-use, compatible and, ultimately, totally cool JavaScript libraries to make your web sites and web applications fly, Web 2.0 style.
YahooUI	http://developer.yahoo.com/yui/	a set of utilities and controls, written in JavaScript, for building richly interactive web applications using techniques such as DOM scripting, DHTML and AJAX.
Google code	http://code.google.com/	opensource Programmazione Web ajax api code community cool dev development documentation download examples framework

kumuといったものや、shibuya.jsなる団体もある。僕がやりたいことは、いずれにしても何かしらのjsの上にのっかる部分なんだけど、ちゃんと勉強するにゃ、自分で、作って、いろいろ試すほうがよさそうだ。