This is what I've found out so far for various nomenclature...
Middle C = C5, Fruity Loops
Middle C = C5, Bandlabs Sonar
Middle C = C5, Mixcraft
Middle C = C4, Reaper
Middle C = C4, Roland
Middle C = C3, Cubase
Middle C = C3, Yamaha
Middle C = C3, Kontakt
Middle C = C3, Studio One
Exactly how do you come up with this? Do you own these products? Are these products sounding a musical pitch and you are checking them against a tuner? If this is true it appears to me a lot of programmer analysts need to come out into the real world. The programmer's programming the tuners all got it correct.