WordPress was first launched on May 27, 2003, by its founders, Matt Mullenweg and Mike Little. As of September 2013, version 3.6 had been downloaded more than 6 million times. WordPress was originally designed as a blogging platform.
wordpress have some plugins for developed site of ecommerce solutions i.e wp-e-commerce and Woo commerce for wordpress plugin.
WordPress provides so many plugins and themes for free