[FunCaptcha]

Hello,

We’ve just added full support for bbPress to FunCaptcha: http://wordpress.org/plugins/funcaptcha/

You can try a demo of FunCaptcha on our site, but signup is easiest through the WordPress Plugin for your WordPress sites!

Let me know if you have any further requests for FunCaptcha using bbPress!

Kind regards,
FunCaptcha team

[Stephen Edgar]

We also fully support showing FunCaptcha on bbPress topic creation and for replies.

Awesome 🙂

[FunCaptcha]

Yep, works great with Anonymous posting turned on, no need to signup to make topics or response, but still safe and secure from all types of bots!

This will allow you to have a low barrier to entry, while still keeping spam free.