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I recently came across a website which supports OpenID.
After I logged in to that web site, it said my account was successfully associated with the one I have at Stack Overflow.
The UI of that web site looks very similar to that of Stack Overflow.
My question is: what kind of open source application is Stack Overflow using?
I mean, I don't know if it is an open source application like phpBB.

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migrated from Aug 11 '10 at 6:48

This question came from our site for professional and enthusiast programmers.

All sites in the Stack Exchange Network...

... have the gen-u-wine Stack Exchange branding in the upper left corner of the website.

If you see this branding, that means the site is an official part of our network.

If you don't, that means it is not affiliated with us.

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"... that means it is not affiliated with us..." - either that or it's a scam - run! – uɐɯsO uɐɥʇɐN Aug 11 '10 at 8:07
Quite easy to fake an image in HTML, just sayin' – Tom Aug 11 '10 at 9:29
+1 @Tom but I think it might be a little harder to fake the viewable inbox messages which appear when you click in that branding. – Fabrício Matté Jul 15 '12 at 9:00

StackOverflow has a number of sister sites; they're listed at the bottom (scroll down!). You might find the site down there.

As for an open source version, check out Shapado. It's not exactly the same, but it does a decent job. Only downside is it's written in Ruby (unless you like Ruby, in which case hooray!)

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Look at this Stackoverflow blog post which explains what SO was built with. But - will be moved to meta, probably.

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