UIZE

UIZE (pronounced "you eyes") is a powerful, open source, object oriented JavaScript framework - supporting widgets, AJAX, DOM, templates, and more. You can call it an "Ajax Framework", an "Ajax Toolkit", a "JavaScript Framework", a "JavaScript API", a "JavaScript Toolkit", a "JavaScript Toolbox"... whatever you like! We call it the UIZE JavaScript Framework (or just "UIZE" for short). UIZE allows you to create more effective user interfaces in your Web-based applications and services.

• UIZE is open source.
• UIZE is free to use (distributed under the terms of the GNU General Public License).
• UIZE does not extend native objects, and supports interoperability with other libraries that adhere to this principle
• UIZE is in active development, by a team of experienced programmers, and is used on zazzle.com - a high profile, consumer facing, e-commerce Web site.
• UIZE is server agnostic - so you can use it with any choice of server language and platform, including Java (Apache TomCat), C# (IIS / ASP.NET), Visual Basic (IIS / ASP), C/C++, Perl (Perl / Apache), PHP, Ruby (Ruby on Rails), Python, etc.
• UIZE implements systems for JavaScript Inheritance, JavaScript Events, JavaScript Modules, JavaScript Libraries, JavaScript Templates, JavaScript Widgets, JavaScript Localization, JavaScript Documentation, JavaScript Code Compression, JavaScript Build Scripts, and many more powerful capabilities.

http://www.uize.com