update : 23/12/2020 TYPO3

TYPO3 is the fruit of several years of labour by a Danish guru by the name of Kasper Skårhøj. Since its relase, late 2000, a very active community has assembled and ensures the development of CMS.

In terms of ready to use functionalities, TYPO3 is one of the richest CMS tools on the market. It offers just about everything one might want, all of which is nicely polished and with very few limitations: rights and contribution management, caching, authorisations, templates and more. TYPO3's major strength lies in its expandability. An extension can add a series of functionalities to TYPO3, but it can also modify a previously integrated functionality without altering TYPO3’s source code, thus maintaining its compatibility with future versions. The last version 6.x has better ergonomics, offers a powerful file management allowing the use of external cloud and other storage options (Amazon S3, Dropbox etc.) and includes a new extensions manager enabling the use of Flow packages and dependency management through Composer. Another new feature, definitely mobile oriented, the Responsive Images automatically adapt their displays to the target. Last but not least, the quality of the code has been further enhanced, with more than 5,000 automated tests performed and PHP 5.5 compatibility.

TYPO3 is a 100% community based solution published under the GPL.
TYPO3 is written in PHP and uses a MySQL database.