WordPress is the most popular and well supported content management system. You can gain access to thousands of free themes and plugins to build your website for free without any initial investment using WordPress.
Sign up for WordPress.
Wix has a user friendly drag and drop website builder. You can create a flawlessly designed website with Wix with just a few button clicks. It also has themes and plugins available to you, and the platform is free to use.
Get Started with Wix.
If you have an idea that requires a bit more in functionality, Drupal may be the best platform to build your site with. Drupal is free and is an open source content management system.
Learn more about Drupal.