Thanks for replying, I thought the thread hab been left deserted. I've checked vaultwiki and I guess it could work for me, a bit expensive though (costs more than the actual xenforo license). Also I've checked xencarta.
In the website I have in mind, the wiki is the central idea, but I'd like to make it more participative, so people can discuss anything they like about entries and add pictures.
In my mind it would look a bit like this one, but with an integrated forum: