This module provides a basic input filter to add rel="nofollow" attributes to outgoing links generated by any other filter that may generate URLs.
It fills a gap in the core Drupal filter system in that, albeit the core HTML input filter has an option to add rel="nofollow" attributes to URLs, there's no way to add this attribute to an URL generated by other URL-generating module (such as core URL filter).
Short name
relnofollow