What CMS Agents/Plug-Ins do?

Hi,

   Before I forget, we are using version 7.1 SP2 of CMS.  

   I am writing up a definition of what agents are installed with CMS and what they are there for.   I have done Google searches for the name of these agents and I have not found a list of the agent/plug in names that tells me what exactly each one does.   Does anyone have a link to a page that has this (not just the versions) that I can refer to?  I would think other people would like to know what is installed on the systems when an agent is deployed.   Any help would be appreciated.  

Thanks,
Jamie