Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Bludit - Bludit is a web application to build your own website or blog in seconds, it's completely free and open source. Markdown support.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Grav - The modern open source flat-file CMS
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
WordPress - WordPress is web software you can use to create a beautiful website or blog. We like to say that WordPress is both free and priceless at the same time.