Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Hotello - Hotello is a SAAS cloud or on premise hospitality management software that manage establishment's day to day operations and customer service.
ClassicPress - The WordPress fork. No Gutenberg. Great future!
RDPWin - Property Management Software for clients who have outgrown their current system.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Hotel Reputation Management - MHR's Complete Solution to Increase your Hotels Rating, Ranking and Guest Satisfaction Index through Review Response and Social Media optimization.