OPERA Property Management System - OPERA Cloud Services is an enterprise platform for hotel operations and distribution.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
RDPWin - Property Management Software for clients who have outgrown their current system.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Cloudbeds - Cloudbeds is the platform that powers hospitality, enabling tens of thousands of lodging businesses in more than 150 countries worldwide to grow and thrive.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more