AdSense ClickFraud Monitoring WP Plugin
AdSense ClickFraud WP Plugin
This plugin makes sure one IP can only click one ad per day (configurable) on your website. It has prevented me from getting banned for 8 years, after being banned from AdSense 4 times previously.
This plugin is free!
In newer versions, they decided to make the same plugin a premium plugin. However, this version which I have kept still works and is still free to use.