Rhys Wynne

This plugin quite simply lets you know where the users entered your site when they leave a comment. A lot of people who joined the do-follow movement are listed on sites which are a target for comment spammers. To those who suffer comment spam can now find out the page they come from, and block accordingly.
This plugin uses a cookie to track the commenter, so if the user hits the first page first, they will still be tracked.

InComment

Adds an extra "referral" note to the bottom of comment forms, so you could see where people come from comment. Useful for finding resources  …

For Games

This is a very simple but very helpful tool to help your bbpress makes internal links dofollow and external links nofollow.
We all know that on bbpress all links are nofollow. But many times, We have many internel links on bbpress topics or replies. For SEO purpose, We should make internal links dofollow and external links nofollow. So, I developed this little plugin.
This plugin is based on bbpress, please install bbpress first.
This plugin does not have any options to set. Just install it and everything’s ok

BBP DoFollow

A helpful tool to makes your bbpress internal links dofollow and external links nofollow.

InComment vs BBP DoFollow