The plugin automatically makes all the comment links to your own domain dofollow, while all external links remain nofollow.
Plugin Tag: dofollow
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BBP DoFollow
A helpful tool to makes your bbpress internal links dofollow and external links nofollow.
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SMu Manual DoFollow
SMu DoFollow has many DoFollow Options (Manual or Automatism) and included URL Validator (Manual, WP-Cron or Cronjob).
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Nofollow Case by Case
"Dofollow" but Nofollow Case by Case allows you to selectively apply nofollow to your comments as well.
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DoFollow Case by Case
DoFollow Case by Case allows you to selectively apply dofollow to comments and make links in pages or posts nofollow.