Grav is a Fast, Simple, and Flexible file-based Web-platform framework. There is Zero installation required. Just extract the ZIP archive, and you are already up and running. Although Grav follows principles similar to other flat-file CMS platforms, it has a different design philosophy than most.
There are many powerful open source CMS solutions for building complex websites. Some of the more commonly used ones are Drupal, Joomla, and WordPress. The downside of these Content Management System, (CMS) platforms is that they have a steep learning curve associated with them. This requires a significant amount of your time and time that you don’t have to learn.