tobyhage

Are you also tired to pay expensive monthly subscriptions to keep track of your keywords. With this plugin you don’t need this services anymore. 
Keep track of your keywords on your own WordPress site for free.
The Seo Monitor was built to offer a simple ranking measurement tool for WordPress websites. You can now view how your website (or other websites) ranks for a number of different keywords right within the WordPress admin panel.
<h4>Features</h4>
<ul>
<li>Track your rankings on Google</li>
<li>Search using other Google Country URLs (e.g. google.co.uk)</li>
<li>Add as many websites and keywords you want</li>
<li>View historical ranking graph for each keyword</li>
<li>Keywords can be filtered on website, group, search engine or by search term. All data is sortable.</li>
<li>Action Log, all actions are logged in the action log. This log will automatically clean items older than two weeks. You can also delete log actions manually.</li>
<li>Delete single rankings per keyword, so that you can delete for example sample data.</li>
</ul>

Seo Monitor

Seo Monitor is a free WordPress plugin to monitor your SEO performance for your website(s).

TheWebmaster.com

Built by www.thewebmaster.com this plugin shows the daily updated Rank Risk Index by Rank Ranger. It shows the SERP fluctuations for over 10,000 domains and keywords to give a fairly accurate account of when Google’s serps change. This will enable you to address negative results quickly.
The plugin will add the Rank Risk chart to your admin dashboard. In addition, it will add a widget (although this is quite wide, so may not fit in a sidebar). Thirdly, it creates a shortcode so you can insert the Rank Risk chart into any page or post by using the shortcode “[rankrisk]”.
Feature requests and ideas welcome: admin@besthostnews.com

RankRiskIndex

This plugin shows the daily updated Rank Risk Index by Rank Ranger

Seo Monitor vs RankRiskIndex