FoxPro. I credited it for don't fear and be good at use RDBMS. Also, the most productive dev environment ever. Python (+Django). To show me how good syntax a

FoxPro. I credited it for don't fear and be good at use RDBMS. Also, the most productive dev environment ever. Python (+Django). To show me how good syntax and well design API make the difference. Also, I'm mostly on python after all this years so is my main income generator! Delphi (until get too expensive and all the inestability...) What RAD is. I was able to circle around some local competition that waste time with .NET or others tools. Better than any else for GUI, far better for DB development that many (except FoxPro, of course). After the above, is from bad to worse. ALL other dev environments provide sub-par experience, more dev time, worse at RDBMs development, etc. ---- iOS. My main differentiation and second income generator. In my country (Colombia) the developers are mostly on Android. I'm one of the few that do "native" iOS development. --- F#. Because is my gateway to the ML family, AGDTs and almost as good as coding in python, except for the use of type inference.