Any successful website built on top of Google App Engine?

I would like to know whether there are any websites (not toy projects) that have been successfully built on top o开发者_如何学编程f GAE (excluding google) using whatever programming languages or frameworks that are available.

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Yes, of course there are. We've featured a few of them on the blog in the past, including webfilings, Wolfire games, and Neptune's Pride, to name a few.

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Overgrowth looks fairly big.

The App Engine gallery, but it has been closed.

And there is also StackPrinter...

See: 5 cool web applications hosted on Google App Engine

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Snapchat uses Google App Engine. They just turned down a $3 Billion offer I believe, so they are very successful in that sense. Source: Gigaom Article

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WordsKeeper - web application for foreign language learners.