So, does the source code is open source?
At the bottom of both sites it says ‘powered by Askbot’.
And ask.openstack.org also links to the source: https://github.com/ASKBOT/askbot-devel
From the Readme:
Commercial hosting of Askbot and support are available at https://askbot.com
And the license section:
Askbot software is licensed under GPL, version 3.