DoFollow Case by Case allows you to selectively apply dofollow to comments and make links in pages or posts "nofollow".

"Dofollow" but Nofollow Case by Case allows you to selectively apply nofollow to your comments as well.

The "Smart DoFollow" plugins lets you automatically give DoFollow links to authors of comments that are longer than a given number of chars.

SMu DoFollow has many DoFollow Options (Manual or Automatism) and included URL Validator (Manual, WP-Cron or Cronjob).

DoFollow State let your Wordpress webblog have dofollow structure for all links including links on comments.

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

The plugin automatically makes all the comment links to your own domain dofollow, while all external links remain nofollow.

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

NFCBC SEO Light - The light version of [Nofollow Case by Case](http://www.fob-marketing.de/marketing-seo-blog/wordpress-nofollow-seo-plugin-nofollow-c …

140follow removes NOFOLLOW from author link if the comment has more than XXX characters.

This plugin enables you to set rules for visitors to get a dofollow backlink on commenting.