The Pros and Cons of Simple Machines (SMF) Forum Software
On the bright side, it has uploaders for themes and mods - and this can be a huge help to newbie developers. However, though, on the negative side, you have to be careful your theme matches your forum version. Otherwise, there could be time-out errors for certain login boxes. Nonetheless, that situation is actually easy to fix. You simply do a little code work, but then again, newbies would have a tough time or have to pay.