Swiss Army Knife for bbPress

I’ve been a user of this plugin for years. It’s a HUGE time-saver customizing the look-and-feel of bbPress forums and even adds some essential forum functions like subscriptions, moderation, and site integrations.

Disclosure: I’ve contributed code to this plugin, so of course my rating is biased. Don’t take my word for it, just look at the swift responses in the support forum and the abundance of 5-star reviews.