Welcome to the Question2Answer Q&A. There's also a demo if you just want to try it out.
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+1 vote
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.
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.