Scripts››Answers,Q&A,Stack Overflow,Yahoo! AnswersClone Script
Answers.com is an Internet-based knowledge exchange, which includes WikiAnswers, ReferenceAnswers, VideoAnswers, and five international language Q&A communities.
Question2Answer (Q2A) is a popular open source Q&A solution, currently in use on 7,769 sites in 40 languages. It is built on the standard PHP/MySQL platform, and runs safe and fast.