Case Study of Massively Successful Tool?

[JB_Upstart]

Hi, all. I'm working with a client and trying to come up with an example or two of a tool that attracted huge numbers of inbound links. What come to my mind is the original Zillow home pricing tool. When that came out, it kind of blew people's minds that you could put in any address in the United States and you'd get a (moderately) accurate assessment of a home value. If I recall, they got a bajillion links overnight.

I don't need an example quite at that scale (in fact, a smaller success might be better), but I definitely want something a little more recent (even if just the last five years).

Any suggestions for me? Much obliged.

-Erik

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