Did you check the wiki (software using Smarty) ?

Maximillian Von Schwanekamp wrote:

> Posted this so the Smarty forum, but no replies, so now it goes to the
> list: Anyone know of a forum app that is suited to use with Smarty?
> We need to integrate a forum into a site group that makes heavy use of
> Smarty to present multiple sites from one codebase and one database.
> Most forums that I've seen seem to have the application logic tied to
> presentation overly-tightly. I'd like to be able to say, instantiate
> a forum object and pull discussion threads from it as deep arrays, and
> send that to Smarty for presentation. Surely someone has travelled
> this road before? I can write it myself, but it would be nice to use
> a more mature app for something so user-intensive as a forum.
>
> TIA!