@AntiEarth well, by "commercial server software" ? you say you mean backup/file serving software. Do you mean like dropbox re file serving? To find others, google for alternatives to that.
acronis does backup and does imaging, so if you want to find others like it, then look up alternatives to that.
really what you call server software is just regular software but that has been configred to listen.
As to how they discover things, I think probably companies.. one company usese it, an employee comes from one company to another. Or a company's IT department recommends it maybe the manager of the IT department found it somehow. Not sure how IT managers find different things.
though nowadays many companies might subcontract and have no or small IT departments. But still anybody that has worked in a company sees particular things used.