Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
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.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Enonic - Enonic XP is the Javascript fullstack platform that powers Enonic Apps.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Contentful - You don't need another CMS. You need a better way to manage content — unified, structured, and ready to deploy to any digital channel.