Content management system similar to StackOverflow.com
I'm looking for a content management system that will have features similar to stackoverflow:
Users can ask and answer questions. Users can search existing streams. The system is controlled by access - so some users may be readers / writers / admins. Some or all of the QnA streams should be visible to registered users only.
So far, I've mostly used wordpress as a CMS, but it doesn't seem to be suitable for this specific task.
a source to share
WordPress is approved as a CMS, but really just for posting articles within a structure and easy commenting. If you want something as beautiful as StackOverflow, you can license it commercially.
PHPBB2 is a nice open source bulletin board forum and VBulletin is a commercial option. They both use PHP, MySQL, etc.
a source to share
It's not free and hosted, but you can have your own stackoverflow from the people who created it! More details here: https://meta.stackexchange.com/
a source to share