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by listic 3760 days ago
Isn't StackOverflow open source?
4 comments

User content is under a free license (and dumps are provided), but the engine is proprietary.
There are a few alternatives: http://meta.stackexchange.com/a/37953
Originally their software was available as download to third parties (but without sources AFAIK), but it no longer is.
Not as far as I'm aware.