MyBB Community Forums

I know almost no forum without a guestbook but it seems MyBB doesn't seem to offer one, and also I didn't find any Plugin. Is there a way to implement one for your forum?

There are couple I am aware of made for v.1.6.x

https://mods.mybb.com/view/user-guestbooks
https://mods.mybb.com/view/profile-comments

It should not be hard to make those working with 1.8.x. May be there are already upgraded versions available somewhere.