Depending on what exactly you are trying to do, I've found wikis like Confluence pretty good for quite a few things. It used to have a halfway decent forum add

Depending on what exactly you are trying to do, I've found wikis like Confluence pretty good for quite a few things. It used to have a halfway decent forum addon, and the ability to have the wiki features/content embedded was enough to convince us not to try and use a separate forum.