WordPress is not the only CMS in Town. It simply became the most popular.
Now people are beginning to wonder if it has a future, especially with all the talk about Gutenberg being a development that will put a lot of users off from continuing to use WordPress.
There have always been alternatives, but none has been as supported by the amount of plugins, themes, and followers as WordPress.
The big three always seemed to be WordPress, Drupal, and Joomla. WordPress gained in popularity to become the CMS of choice, due to its huge following and the development of thousands of plugins and ready-made Themes, and its comparatively user-friendly interface.
CMS Made Simple
Now we can add a few more to the list.
There are also other e-learning and content management systems such as Moodle and Chamilo
This blog examines the future of Gutenberg and WordPress: