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.
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.
TYPO3 - TYPO3.com - Infos, SLAs, Extended Support Versions and more
Pics.io - Pics.io is a cloud service that people can use to manage their creative content and files, collaborate with their peers on this content, and then share it with their clients. Read more about Pics.io.