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Javascript Libraries
Javascript Libraries provide pre-written add-on functionality that makes writing your scripts easier in return for the overhead of having what could be a large library that always needs to be downloaded along with your web page. How practical they are depends on how much of the functionality that you use.
Modular JavaScript Library
Instead of one huge JavaScript library where you probably will never use half of what it offers, why not use a modular approach where you just include those objects that you actually need.
Script Libraries From Google
Since many JavaScript libraries are huge and would seriously slow the loading of your web page if the library isn't already in your visitor's browser cache, Google increase the probability of your visitor already having cached the library you are using by loading it from Google instead of your own site.
Prototype
Prototype is one of the most popular of the Javascript function libraries as well as one that some of the others build on.
Mochikit
MochiKit is a highly documented and well tested suite of JavaScript libraries that will help you get things done, fast.
Yahoo UI
An alternative collection of Javascript functions provided by Yahoo.
Scriptaculous
A collection of Web 2.0 style JavaScript libraries that help web developers add AJAX functionally to projects.
JQuery
jQuery is a fast, concise, JavaScript Library that simplifies how you traverse HTML documents, handle events, perform animations, and add Ajax interactions to your web pages.
Dojo
Dojo allows you to easily build dynamic capabilities into web pages and any other environment that supports JavaScript sanely.