TYPO3 is a free and open-source content management system written in PHP. The CMS is released under the GNU General Public License which makes it free to use for commerical and non-commercial projects alike. TYPO3 can run in most hosting environements and provides an easy way for people to write, manage and publish content online.

TYPO3 Information

Platforms: Self-Hosted and PHP
Pricing: Free
License: Open Source

TYPO3 Recommendations