8051 programming

Hello guys, Im in college atm and I own an macbook air and I want to code an 8051 microcontroller. The program I was suggested to use was Keil, but sadly it doesnt have a version to mac. Im here to ask for your help because I really need to find another way to code my 8051. The Parallels Desktop program is really expensive so I was trying to find any program that would have an mac version already.

Thank you very much and sorry for any bad writing. :)