When the office WordPress Plugin Directory was launched, we made a decision to remove all the WordPress Plugin references from the WordPress Codex and replace them with either a link to the Plugin Directory, or the Plugin page on the Directory. All mentions of Plugins throughout the Codex must be found and corrected accordingly, including links to the former Plugin lists that are now gone from the Codex. If a Plugin is not in the WordPress Plugin Directory and there isn’t something similar, be cautious about linking outside of the “official” sites.
Links to WordPress Plugins that are not part of the “tutorial” but just a self-promotional link are not permitted. Please remove these.
NOTE: In general, the WordPress Codex does not link nor recommend paid/premium Plugins unless they have been vetted and verified to be compliant with WordPress GPL.