Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Pimcore - Pimcore is an award-winning data management and customer experience management software.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
Boomi - The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
SAP NetWeaver - SAP NetWeaver enables the composition, provisioning, and management of applications across a heterogeneous software environment