Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Figma - Team-based interface design, Figma lets you collaborate on designs in real time.
Anchor CMS - Free and lightweight blogging system
Invision - Prototyping and collaboration for design teams
Textpattern - Textpattern is an elegant content management system that is free, open source software.
Sketch - Professional digital design for Mac.