Themes like WPMU Community forum?

Hi,

I was looking for a good forum for WordPress and found that WPMU Community is the perfect fit!

There are only two things I am looking for:

– Categorization: WPMU Community has ability to show all threads as well as by their category (General, advanced, themes etc.)

– Ability to upload files/pictures: BBPress still doesn’t support file uploads (it’d be a shame for a forum to not to support the feature!)

Do you know how it was made? Is it a wordpress plugin/theme? Can I buy/download it from somewhere?