The Claymore Card Filer allows you to create a list of individuals and their contact information and sort them by resource and class. This system is particularly useful for sales and customer service staff. Each staff member (resource) can have their own list of contacts and organize them as they see fit. Each contact has a series of custom fields that can be used to track various useful bits of information.

Even though this software is free, it is well supported. There is an online support center at http://www.blinkdevelopment.com/ClaymoreCardFilerSupport
Here you can find an FAQ and a support forum.