Sulu is a flexible content management system (CMS) built on Symfony, one of the most popular PHP frameworks. It’s open-source, allowing businesses to easily manage content across multiple platforms, from websites to mobile apps. With its solid architecture and user-friendly interface, Sulu provides advanced features for developers while keeping things simple for content editors. The integration with Symfony makes it easy to extend and customize, making Sulu an ideal solution for companies looking for modern, scalable tools.