Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Sitecake - Drag and drop CMS for HTML websites. It's flat file CMS so it's pretty fast.
Sketch - Professional digital design for Mac.
Anchor CMS - Free and lightweight blogging system
Affinity Designer - Professional creative software, exclusively for Mac.
Textpattern - Textpattern is an elegant content management system that is free, open source software.