There was this horrible site called experts-exchange.com (note the hyphen) that dominated search results, but IIRC they made you pay to see the answers.
I honestly don't know if it helped move web development forwards or held it back!
Even these days if i'm having a poke around somebody else's work, one of the first things i do is to pop open the dev tools and start seeing which libraries they're running and what their custom namespaces are.