Camunda - The Universal Process Orchestrator
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Appian - See how Appian, leading provider of modern low-code and BPM software solutions, has helped transform the businesses of over 3.5 million users worldwide.
Anchor CMS - Free and lightweight blogging system
Kintone - Build business apps and supercharge your company's productivity with kintone's all-in-one...
Textpattern - Textpattern is an elegant content management system that is free, open source software.