TYPO3 is a free, open-source CMS based on PHP, released and distributed under the GNU General Public License. Initially released in 1997, TYPO3 is now leading enterprise-class loading software empowering 1.1 million websites the Internet and proudly holds one of the leading positions along with WordPress, Drupal, and Joomla!.
TYPO3 is an established CMS in the niche of engineering and industry fields. The software is tailored for large, heavy, and complex projects that require high diversity, power, and modularity. Compared to other CMSs, TYPO3 comes well-powered with a default set of features, eliminating the need for installing additional plugins and modules.
Mobile and SEO-friendly are mandatory nowadays, and we can say with no doubt that TYPO3 is covered in both aspects. It is fully responsive, and it comes with built-in SEO features. On top of that, Yoast SEO is available for it.