Welcome to the Question2Answer Q&A. There's also a demo if you just want to try it out.
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I think, this is just similar script. However stackoverflow is most know now q&a in many areas, but was not first. Here more other scripts like this.
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Stackoverflow was first, q2a is similar but has one really important advantage for the most webmasters, it is based on php/mysql.
Besides q2a development is user driven, with each new version new features the users asked for are included. That makes it more flexible and goes far beyond a question and answers script.
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