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
ExpressionEngine is a powerful content management system that excels in flexibility and community support, making it suitable for complex projects. In contrast, ProcessWire offers a lightweight and highly customizable framework with a user-friendly interface, ideal for developers looking for simplicity and speed.