From Joomla! Documentation
< Archived:Platform PortalRevision as of 23:19, 28 August 2012 by Tom Hutchison
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.
You can download the platform at https://github.com/joomla/joomla-platform