WordPress, the world's largest open source content management system (CMS), has just become even more open sourcier. 

Chalk it up to some changes from Automattic, the web development corporation most notable for its contributions to WordPress and WordPress.com, the hosted version of WordPress.

Automattic has overhauled WordPress.com, opened the script to developers on GitHub, and made the code available under the GNU General Public License version 2. It also moved it away from PHP and MySQL and built it on JavaScript and API calls.

Automattic code-named the rewrite Calypso.

Calypso separates WordPress.com and WordPress, and enables WordPress.com to interact with WordPress the same as any other third-party app.

According to the WordPress.com, the redevelopment result from a comprehensive rethinking of the technology and workflows for building websites and managing content.

“Our existing codebase and workflows had served us well, but ten years of legacy was beginning to seriously hinder us from building the modern, fast, and mobile-friendly experiences that our users expect. It seemed like collaboration between developers and designers was not firing on all cylinders," Andy Peatling, Calypso project lead, wrote in a blog post.

Needless to say, this means that there is considerable difference between the old and the new WordPress.com.

Overall, it makes WordPress.com more mobile-friendly and less like a HTML-based website.

It is an interesting move and comes only a month after research from W3Techs showed WordPress is used by 25.3 percent of all the websites and that it has a content management system market share of 58.7 percent. The W3Tech research also showed that WordPress' closest competitors, Joomla and Drupal, have combined are usage of only 4.9 percent.