GEO Source Code

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.

Download
http://www.prototypejs.org/download

API Documentation
http://www.prototypejs.org/learn

script.aculo.us is a set of JavaScript libraries to enhance the user interface of web sites. It provides an visual effects engine, a drag and drop library (including sortable lists), a couple of controls (Ajax-based autocompletion, in-place editing, sliders) and more.

Home Page:
http://script.aculo.us/

Demos:
http://github.com/madrobby/scriptaculous/wikis/demos