For many years I ran a private online forum using phpbb. The software is very similar to vbulletin except its totally free. It's very secure and works great. There are also lots of extensions (plugins) to enhance functionality and the look and feel. The only cost was the domain name and hosting service which came to about $10 per month. If the volume low, you could find a cheaper host. Check it out at phpbb.com
Wordpress also has a forum which might be easier to install and maintain.
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