SiteSwan Website Builder is a proprietary website building software that is built and managed by our own team of all USA based developers, programmers and designers. The platform itself is built on Ruby on Rails, and the sites themselves are written in lightweight HTML5 with some light javascript. All SiteSwan sites are fully responsive and platform agnostic, so they'll work on any device and the latest operating systems. We use Rackspace and AWS to provide super secure cloud hosting for all of our sites.
If a client happens to ask "What platform is my site built on?", and you do not want to divulge that you are using SiteSwan, you can tell them something like this...
"We build our sites on a proprietary website building platform that only digital agencies have access to and is specifically designed for building small business websites. We use Rackspace and AWS to provide reliable, rock-solid hosting and all of our sites include an SSL Certificate and are loaded on a 256-bit encrypted https: connection for added security."