Drupal is described as 'Open source software with modular architecture, structured content support, thousands of add-ons, custom themes, and robust security for dynamic web projects' and is a very popular CMS tool in the business & commerce category. There are more than 100 alternatives to Drupal for a variety of platforms, including Self-Hosted, Web-based, Windows, Linux and Mac apps. The best Drupal alternative is WordPress, which is both free and Open Source. Other great apps like Drupal are Ghost, Joomla, Jekyll and Backdrop CMS.
Combines simplicity, flexibility and power in a fully open-source CMS with features such as in-line editing, SEO-friendly URLs, custom routing.