An easy to use plugin that gives you control over nofollow tags. It's as easy as checkboxes. Doesn't use much overhead and does not conflict with any other themes or plugins I'm currently using. Great, responsive developer. Thanks for this one!
UPDATE 4/27/15: Sad emoji.
One of the easiest ways to select links to get a nofollow. The easiest way I've found to be selective with my property's SEO juice.
Unfortunately, this (and other plugin's like it) break WordPress 4.2.x. I was unable to use the links dialog box until I deactivated this plugin.
Hopefully, this will be fixed soon. This is a five-star plug-in otherwise!