A good low cost control valve sizing program ,Any good engr/programer who understands control valves, fluid flow, sizing .
Most free or very low cost sizing and selection software given away by a vendor is generic by nature and won't contain all the selections that their in-house propriatary sizing software will give them.
First, they can't trust that untrained persons will fill in all the really technical but necessary parameters needed to make a proper selection, and:
Second, they don't know where those programs will end up, and they certainly don't want their propriatary designs to end up on the desk (computer) of their competitor.
You are probably not going to get much more than you could calculate by using standard engineering references but at least the software will take the tedium out of the process, and allow you to use modern tools.
So, use anything you get with that in mind.  Still, most of them will allow you to do some decent process evaluations, etc., and run it over and over until you get it close.

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