Xenoforo AddOn

For those of you who use Xenforo as your forum software, or even as someone who participates on Xenforo forums, what are some of your favorite addons. What do you think enhances the game or even just the community?

 

One that I saw while browsing the XenForo site was the SubAccounts extension. This would allow for a more immersive character feel for both the player and the audience. At least, that's the way I understand how the mod would work.

I'm sure there's other that I have yet to discover, and if I end up purchasing XenForo, I'm sure to discover them, indeed!