This simple plugin ads a rel="nofollow" In Posts Links searches for links to large websites that use the 'nofollow' tags for external links, and puts the same tag on your links to those sites.

Nofollow Tags For Movies Sites adds the nofollow tag to all of your outgoing links to video hosting websites. Perfect if you're running a movies blog.

No Follow Tags In Posts Links searches for links to large websites that use the 'nofollow' tags for external links, and puts the same tag on your links to those sites.

Adds credits to the media uploads: Source and source URL. URLs are nofollow by default.