The Joomla Platform is a platform for writing Web and command line applications in PHP. It is free and open source software, distributed under the GNU General Public License version 2 or later. The Joomla Content Management System (CMS) is built on top of the Joomla Platform. For more information about the Joomla CMS visit: http://www.joomla.org/about-joomla.html
You can find out more about Joomla development (though not platform specific) at: http://docs.joomla.org/Developers
You can discuss Joomla Platform development at: http://groups.google.com/group/joomla-dev-platform
A guide for contributing to the Joomla Platform can be found at: https://github.com/joomla/joomla-platform/wiki/Contributing-to-the-joomla-platform
- PHP 5.3+
Get the source code from GIT:
git clone git://github.com/joomla/joomla-platform.git
Please ensure you add the following path to your local .gitignore file: tests/test_application/cache