Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Mutiny - Personalize your website for each visitor
Anchor CMS - Free and lightweight blogging system
Webflow - Build dynamic, responsive websites in your browser. Launch with a click. Or export your squeaky-clean code to host wherever you'd like. Discover the professional website builder made for designers.
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Drift - A messaging app that helps you grow your business.