Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Brandfolder - One link to all your marketing assets. Brandfolder is your convenient source to visually organize, quickly find and easily share all your final brand assets.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Widen Collective - Widen Media Collective creates a seamless workflow for the creation, management and distribution of digital media assets throughout digital.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Bynder - Bynder is a cloud-based digital asset management solution for marketing professionals looking to simplify how they manage digital content via one central portal.