If you or your company pay for pay-per-click ads in search engines, and if you are worried about click fraud then you need to use free program called Click Sentinel.
Click Sentinel v1.0 was a paid software program. But, version 2.0 is now open source software. It is antifraud software.
According to site, it provides:
- Free click fraud analytics
- Facilitate vendor/ client relationships
- Encourage and deliver education on click fraud issues
- Provide a community action and awareness approach.