Material - A beautiful graphics framework for Material Design in Swift
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
UX folio - A portfolio builder for UX designers
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Bestfolios - Portfolio website and resume collection from best designers
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more