Comprehensive Capacity Planning Tools

Does anyone know of any FREE comprehensive Capacity Planning Tools?  I'm looking to measure mail stores, DBs, and file/NAS/SAN/VM storage.  The three questions I am looking to answer are the following, in an executive summary, and a comprehensive detailed report for administrators and engineers alike:  What's the current capacity available? What's the current capacity usage? When are we trending to run out of capacity?
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lcohanDatabase AnalystCommented:
I'm only a user of IDERA and so far used a pretty wide wide range of their products with much success and I know they have a set of tools like that (I personally never used it yet)
Other infrastructure good planning free tools are:
and few listed here including Microsoft own:

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