Thamizhchelvan

Asad Zulfahri

patrickcurl

The NoLiP plugin enables you to add the “nofollow” attribute into links in a post within a specified category. This plugin is useful if you are doing sponsored posts. You can set the plugin to add the “nofollow” attribute for posts older than “X” days.
Originally the Nofollow Links in Post Plugin found here: 
http://www.themiak.com/wp-plugins/nofollow-links-in-posts/

NoLiP – Nofollow Links in Posts Reborn

Adds the rel="nofollow" to links in posts within a selected category. Useful for sponsored posts.

Jeremy Green

Adds native ad functionality to your site by marking posts as sponsored.

NoLiP – Nofollow Links in Posts Reborn vs Sponsored Article Content