Stencil for WordPress - With Stencil for WordPress, you can design images as you write posts without ever leaving the page!
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
IncludeWP - Top open-source frameworks for WordPress plugin & theme devs
ClassicPress - The WordPress fork. No Gutenberg. Great future!
WP Plugin Directory - A smarter way to find WordPress plugins
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more