WordPress - Using WordPress to build your business website
The most popular web publishing system in the world - with 22% of all new websites being made using it. WordPress is a free and open source blogging tool and a content management system.
It has many features including a plug-in architecture and a template system. WordPress is used by over 16.7% of Alexa Internet's "top 1 million" websites and as of August 2011 manages 22% of all new websites. WordPress is currently the most popular blogging system in use on the Internet.