I'm trying to find forum software that easily allows for integration into an existing web site. I want users to be able to log in to the web site and then use the discussion forum without logging in again. In addition, I need the software to have most of the advanced forum features, including file attachments, pictures, private groups, etc.). Finally, I'd like the software to be well supported and have a large user community. I don't want to have something that is going to disappear next year.
I am in the process of going through the list provided in the sticky at the top of this forum (which is awesome, by the way) but I haven't found anything yet that meets my needs.
Thanks in advance,