Such a shame there is no macOS support for the new '2021 Community Edition', for either x64 or the newer Apple silicon (M1). As ARM is supported for other platforms (even as a cross compiler only) - not sure why the whole Apple community is being missed out in this update, for both x64 and ARM. Guess AdaCore customers don't use Apple products any more, so hence no availability for the Community Edition either..? One of the benefits of using Ada was the great cross platform support for Linux, Window, and previously macOS.
But the quick answer is that people programming in Fortran use the usual editors - Visual Studio Code, Emacs, Vim, CLion, etc.