Whats This Script/Plugin [Wordpress] Website Directory/Crawler

So I found this site in my backlinks, I've noticed sites such as this before, so my question is, does anyone know what scripts they are using? or what WordPress plugin they are using to crawl and scrape the results and put them into a list such as this. Here is the site below, any help would be great.

What's This Script/Plugin [Wordpress] Website Directory/Crawler
http://dir.topmillion.net/

hexomatic can scrape and create sites like that