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I find it fascinating that so many people seem dissatisfied with the XOOPS forum: newbb/cbb yet there is so little community support for any other forums.
There is a module for phpbb but this goes back to 2004/5
There is a bridge module for smf forums which I have experimented with and its not as good as a fully integrated forum.
There are a number of other forums for the XOOPS platform but they are not as good as the standalone forums like VB and IPB -ipb does have a moduel based on early invision boards, phpbb, smf.
SMF community bords are jam packed with info on how to convert from all sorts of other boards and cms forums, there is a convertor from CBB/NewBB to smf.
I had some success with it but then your site is cut off from your board, the bridge module as I say is not really to my tatse.
I think the phpbb forum module could be updated but its not within my skill set.
Forums are often central to sites perhaps we need more focus on them at XOOPS. Especially the GUI.