Umbraco vs WordPress: What are the differences?
What is Umbraco? Open source CMS. It is a friendly open-source Content Management System and is one of the most widely used ASP.NET Content Management Systems. It is free and offers great flexibility and extensive capabilities.
What is WordPress? A semantic personal publishing platform with a focus on aesthetics, web standards, and usability. The core software is built by hundreds of community volunteers, and when you’re ready for more there are thousands of plugins and themes available to transform your site into almost anything you can imagine. Over 60 million people have chosen WordPress to power the place on the web they call “home” — we’d love you to join the family.
Umbraco and WordPress can be primarily classified as "Self-Hosted Blogging / CMS" tools.
WordPress is an open source tool with 12.6K GitHub stars and 7.69K GitHub forks. Here's a link to WordPress's open source repository on GitHub.