been searching for Wordpress plugin which will make certain widget nofollow (links will have nofollow attribute).

I found this one: Ultimate Noindex, Nofollow Tool - http://wordpress.org/plugins/ultimate-noindex-nofollow-tool-ii/
Atached here: ultimate-noindex-nofollow-tool-ii.zip

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So it dont make any widget nofollow, but at least option to make category and archive nofollow. + nofollow any page (not post)

if you know any other way to make widget nofollow, you can share