Is this just a CMS that you can offer to clients? It says it integrates with Plesk and HSPComplete just don't why it would need to if it's just a simple way of building a site and them managing the content via a backend...

Can this be moved out of Tutorials? Not sure how the hell I got it in here

And moved. :)

Some companies like to bundle great software with their control panel as a way to atttract more buyers. Site builder is consider a good feature that newbie want to have to design a decent site with just a few clicks.