ClearVoice - ClearVoice is a content marketing platform and service solution.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Paperflite - Paperflite is a prospect engagement platform to enable business development reps to see what sells.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Crescendo - Music note writing and composing software
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more