This is the second most popular CMS and the one currently being used for this blog. It is also free to use and even support over 60 languages which makes it a good fit for just about anyone.
A few of the benefits (according to joomla.org) are
- Search engine friendly
- Mobile friendly
- Unlimited design
- Multi-User Permission Levels
There are many volunteers from all over the world that all help build this wonderful, easy CMS. In fact, it is the ONLY CMS built entirely by volunteers. That is one community that gets things done. Even you can volunteer and play your part.
Michael Phelps is just one great example that uses Joomla. There is a whole directory that shows many more examples of outstanding Joomla site. It can be found at https://showcase.joomla.org/.