I use vtiger CRM officially. And it's very versatile. And I think it's got more generic features than Microsoft's Dynamics.
In this post I'll explain to you what vtiger CRM can do. You can check this vtiger CRM YouTube channel for more. And for all the help you'll need in installing, administering and milking the best out of vtiger CRM, visit the vtiger wiki page
I originally typed this in MS Office.
CRM (Customer Relationship Management)