ReCon Meddle Project
This is a project by researchers at Northeastern University, University of Helsinki, INRIA, and Vienna University of Technology to help mobile users analyze network traffic to tell if personal information is being transmitted. In one article about the project, the developer mentions:
In addition, we are going to provide a Raspberry Pi deployment that you can run in your home network
If this were open source, perhaps it could be made into a package for pfSense.