Drupal vs ExpressionEngine: What are the differences?

Drupal: Free, Open, Modular CMS written in PHP. Drupal is an open source content management platform powering millions of websites and applications. It’s built, used, and supported by an active and diverse community of people around the world; ExpressionEngine: Open-Source and feature-rich content management system. It is a flexible, feature-rich, free open-source content management platform that empowers hundreds of thousands of individuals and organizations around the world to easily manage their web site.

Drupal and ExpressionEngine belong to "Self-Hosted Blogging / CMS" category of the tech stack.

Some of the features offered by Drupal are:

• Categorize with taxonomy, automatically create friendly path urls, create custom lists, associate content with other content on your site, and create smart defaults for content creators
• Manage content with an easy-to-use web interface. Drupal's flexibility handles countless content types including video, text, blog, podcasts, and polls with robust user management, menu handling, real-time statistics and optional revision control.
• Users can be assigned one or more roles, and each role can be set up with fine-grained permissions allowing users view and create only what the administrator permits.

On the other hand, ExpressionEngine provides the following key features:

• Your site content is stored in channels—flexible data containers with fields for any type of information
• A Template may contain ANYTHING that a webpage might contain: HTML, JavaScript, PHP, whatever
• Live Preview

ExpressionEngine is an open source tool with 183 GitHub stars and 46 GitHub forks. Here's a link to ExpressionEngine's open source repository on GitHub.