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
Contao is a flexible and accessible CMS that excels in version control and content structure, making it ideal for complex websites. In contrast, ProcessWire focuses on extensibility and developer-friendliness, providing a robust framework for building custom solutions with strong e-commerce capabilities.