Interactive Quote form

There’s probably not a program that was used to do that. It’s more like it’s a collection of scripts written in different langauges. The most common ting for this is JavaScript. I’d suggest looking at jQuery first as it’s one of the eaisest to learn (and it’s built into WordPress). As for “an easy way to incorporate this into wordpress”… The answer is “no”. You’ll need to learn how to write your own plugin, or add some extra functionality to your theme.