What is XenForo?
Xenforo is a commercial forum software developped by former VBulletin developers Kier Darby and Mike Sullivan. It is a strong and popular software for big communities.
Note: The prices above are shown for a first purchase. Those are lifetime licenses but to get premium support and updates, you'll have to renew your annual subscription every year.
Comments and Reviews
Said about XenForo as an alternative
It is much better than any other software and vBulletin