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Possible Duplicate:
Is the Stack Overflow source code available?

Is the script running Stack Overflow downloadable? Are there similar scripts available? I would like to know how Stack Overflow was structured; its function and design are pretty straightforward. I would like to know about approaches to achieving the site's functions.

PS: Is www.squarepolygon.com related to Stack Overflow? I thought that if it was related to Stack Overflow, it would have a link in the footer. I just want to confirm.

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No, it's not open source or anything. They do offer a program where you can have your own SO-like site hosted, at a cost of course.

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Stack Overflow itself is not open-source. You can buy its service at stackexchange.com.

There are some Stack Overflow clones: