Any free software to study riskprofile for a strategy

Hello,

I wonder if there is any free software where you can study the riskprofile graphs for a strategy
you put in. With free, I mean a software that does not have a trial. As long as it is possible
to study how the riskprofile behaves when changing around strike prices and contracts?

 

http://www.hoadley.net/options/options.htm

 

http://www.plcharts.com/strategies

 

Thanks alot, that was very helpful!