No, you don't. Fortran is still an important language in scientific computing, and you don't support it. The gfortran compiler is part of gcc, so I think you should be able to. I also don't see Cobol, Ada, and Pascal. If you don't think these languages are worth supporting, so be it, but asserting that they don't exist may irk people using those languages.
We don't have templates for every language, but if it's available in Nix, you can set this up in a repl. https://replit.com/@ConnorBrewster/fortran
We will be expanding our collection of templates over time, but Nix allows us to make language setup be a user-space concern instead of us internally maintaining a collection of languages configurations and docker images.
Thanks, it works for me. Gfortran is a traditional compiler, but LFortran is "is a modern open-source (BSD licensed) interactive Fortran compiler built on top of LLVM. It can execute user’s code interactively to allow exploratory work (much like Python, MATLAB or Julia) as well as compile to binaries with the goal to run user’s code on modern architectures such as multi-core CPUs and GPUs."
When LFortran is ready, it would be nice if you supported it too, since it is a Fortran REPL.