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by wfn 4372 days ago
There isn't a definitive/exhaustive directory, but see this post: http://donncha.is/2013/05/trawling-tor-hidden-services/

tl;dr it's possible, and you don't have to rely on crawling the web searching for .onion addresses. You can instead become a HS directory authority, and pick your place in the DHT. Eventually you'd be able to get every address that goes into the DHT.