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.

rafaelchacon

jaacob

This plugin makes it easy to install Skyscraper on your blog with minimal effort.
Currently, this plugin handles your initial global install, and gives you a one-click way to embed your Skyscraper Media Kit on your site.
A shortcode <code>[skyscraper-advertiser-here]</code> is also provided so that you can embed your Skyscraper Media Kit wherever you’d like.
This plugin is under active and frequent development.

Skyscraper.io

Skyscraper is an all-in-one revenue management platform built for websites.

NoLiP – Nofollow Links in Posts Reborn vs Skyscraper.io