Is there an easily configured/customised CRM add on available some where that could be used with multiple separate clients i.e separate log in to separate CRM database for each separate client.

Ease of installation would be a must possably using a blank master to copy for new clients and a script that would automate this provisioning when the client is added to the system ultimately this would be part of a e=commerce system that would total automate the sign up and provisioning