BuiltWith is an amazing site that I use regularly.

But it's also an amazing business. 1 fulltime employee. $14m a year in revenue.

Can you name a business more efficient than that? Let's see em.

Didn't expect this to get so popular. Disclaimer: I do not know 100% if this is true. I don't know the founder. I've heard from friends of friends and read interviews/analysis online from what appear to be reputable sources. So, just showing off stuff I'm found - not first hand