WordPress CMS

Blog Tool, Publishing Platform, and CMS — WordPress.org
Open source software which you can use to easily create a beautiful website, blog, or app. Beautiful designs, powerful features, and the freedom to build anything you want. WordPress is both free and priceless at the same time.

WordPress.com: Create a Free Website or Blog
Create a free website or build a blog with ease on WordPress.com. Dozens of free, customizable, mobile-ready designs and themes. Free hosting and support.

WordPress – Wikipedia
WordPress (WordPress.org) is a content management system (CMS) based on PHP and MySQL or MariaDB database servers. Features include a plugin architecture and a template system, referred to inside WordPress as Themes.

GNU Public License | WordPress.org
WordPress is an open source software project, and a fierce believer in the values of the open web. WordPress uses the GNU Public License, which provides a platform for technical expansion and encourages adaptation and innovation. Learn more about this license, and discover what can and cannot be done under it.

Usage Statistics and Market Share of Content Management Systems | W3Techs
What are the most popular content management systems. A diagram shows the percentages of websites using various content management systems. WordPress 35.5%.

WordPress Plugins | WordPress.org
Choose from thousands of free plugins to build, customize, and enhance your WordPress website. Extend your WordPress experience with 55,277 plugins.

WordPress Themes | WordPress.org
Find the perfect theme for your WordPress website. Choose from thousands of stunning designs with a wide variety of features and customization options. Choose from thousands of featured, popular and latest themes.