ProcessWire is a free PHP open source CMS with a great API built to save you time and make development fun at any scale. Developed by Ryan Cramer Design, LLC
License: Open Source
ProcessWire is a flexible CMS suitable for complex websites, while Ghost is focused primarily on blogging and content management with a simpler interface. Users looking for extensive customization and API capabilities may prefer ProcessWire, whereas those seeking a streamlined blogging experience might opt for Ghost.