WordPress is described as 'Open-source software for creating websites and blogs with an emphasis on accessibility, ease of use, performance, and security' and is a leading Blog Publishing tool in the development category. There are more than 100 alternatives to WordPress for a variety of platforms, including Web-based, Self-Hosted, SaaS, Windows and Mac apps. The best WordPress alternative is Drupal, which is both free and Open Source. Other great apps like WordPress are Joomla, Ghost, Blogger and Grav.
Great and easy to use cms for starters and more experienced developers. CMS based on Symfony2.