I’m guessing you found the link to that site from this blog post, yes?
That site webmaster had commissioned me to develop that specifically to meet their requirements around multi-category search within a geographic radius. There’s nothing publically available to achieve that. They also, on their own, heavily modified the Names template (which comes with Connections) and the cMap template to achieve the overall look and function that they wanted. Basically, there is nothing on this site that is “stock”.