Possible Duplicate:
Stack Overflow clones
Is the Stack Overflow source code available?
I just love the technology and design underlying Stack Overflow. They way questions are written, answered, evaluated, the way users get reputation and privileges, how tags are created in a folksonomic way, etc.
I wonder if Stack Exchange has made part of this technology available to webmasters who would like to add a similar Question & Answer (Q&A) engine to their sites. I have seen that Stack Exchange has an API, but as far as I know it is just for querying the websites and databases owned by the Stack Exchange team.
Does anybody know if Stack Exchange has released its Q&A engine, or if there is any similar technology available for free?