It feels like the type of tool that the HN crowd would be building... Bang on, I've been working on something that I've intended to be a cost-effective alterna

It feels like the type of tool that the HN crowd would be building... Bang on, I've been working on something that I've intended to be a cost-effective alternative to BuiltWith. I was thinking about just selling the datasets and allowing users to extract whatever they need from it. What technologies are you after?