What software is required to develop a predictor system?

There are several people out here with computer predicted picks...I'm wondering what software is being used.  I assume excel with an add-on of some sort.  Any help or recommendations on what to use would be helpful.

I'm not about to come up with the next great system but I'm definitely interested  in how some of you are doing this and I'd like to learn more.

Thanks in advance for any insight.