Coordino is an open source Q&A application lets you enjoy creating a question-answering system for you and your users. Coordino was created with PHP and MySQL emulates the functionality of the popular Q&A website StackOverflow. It is built on top of CakePHP and comes with features to facilitate communication and exchange of knowledge to improve within a community easier.

When a user asks a question, the answer is “accepted” as a bonus for users brings, is also the basis of user level is identified in the system. Tags can be any question that the classification of them simplifies and reduces the risk of colon added.
With an Admin Panel, the entire contents and user moderated and there are several safety features such as auto-filter spam, the admin is supported by the standard.
Detail and download: http://coordino.com/