Akeneo - Akeneo is an open-source Product Information Management solution.
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.
Anchor CMS - Free and lightweight blogging system
inRiver - inRiver offers product information management solutions helping B2C and B2B multi-channel commerce tell perfect stories across channels.
Textpattern - Textpattern is an elegant content management system that is free, open source software.