vBulletin

Solid Product, Top Support, Great Community

vBulletin is the first choice for people wanting to administer an online community. Straightforward enough for a beginner to pick up and start using, but with the functionality for power users to really get under the hood. The active modification community at vbulletin.org has produced hundreds of free modifications and styles, all available to licensed customers.
With a skilled team of Support Staff and a large community of vbulletin forum admins, there's always somebody who can answer your questions or give feedback.
If you are considering starting a forum, vBulletin is the software to use!