Ghost - Ghost is a fully open source, adaptable platform for building and running a modern online publication. We power blogs, magazines and journalists from Zappos to Sky News.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
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ClassicPress - The WordPress fork. No Gutenberg. Great future!
Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more