Zingtree offer a great way to create interactive decision trees. If you’re not sure what I mean by this, try out the Zingtree demo at the bottom of this article.
For WordPress users they even offer a free plugin. Unfortunately, it lacks features and doesn’t appear to be supported (they’re updating it but don’t answer queries on the WordPress forum). I’ve therefore created one of my own, named Zingtree Embed.
Using a simple shortcode to add a Zingtree to your site, it’s very simple to use. It also supports all of the Zingtree embedding features (unlike their own plugin).