If VTiger is in PHP, Which CRM is for Rails?

Question

Hi,

I come from a .NET background and just learned Ruby On Rails. My company uses VTiger for Customer Relationship Management. I have no idea about PHP. I am a rails fan, instead of me learning PHP to work on VTiger, I am looking for a solution in Rails. I found Fat Free CRM. Is it good? Also, Are their any better ones?