SO WP started in 2006 as Senlin Online and at that time we were focused on website projects.
Over the years we gained more experience with WordPress and rolled into giving technical support next (re)building websites. Now all those activities are done through our sister company BHI Localization for Websites.
Something else that happened was that we started to develop plugins for WordPress and as we thought that they could be useful for others too, we released them on the official WordPress Plugins Directory.
The SO WP website has now become a library of all the WordPress plugins we have developed, both current releases and plugins that we have retired from WordPress, but that still exist on Github.