Here is the doc for the Capacity Manager Suite...
CCR System Requirements - CA Capacity Management - 2.9.4 - CA Technologies Documentation
The DM or Data Manager is just that the manager which you set up via Adapters to pull data from Vcenters etc...
CCC will show some charts and graphs of usage
CCR is the Reporting tool for the Data Manager
Capacity Manager is a desktop tool that does your modeling
It's a large task to install and configure if you have not already done so...