I created a Fortran playground that can compile and run programs with gfortran, ifx, LLVM Flang, LFortran, and ofort. Code can checked with Fortitude and formatted with fprettify. You can choose the Fortran standard used. There are about 20 programs demonstrating the features of Fortran, some taken from FortranTip. It is powered by the same Modal service mentioned in Python to Fortran transpiler is online.
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With the earlier playground I was creating a web page where you could click on the name of the majority of the intrinsic procedure names and it would load the example from the fpm-man program.
https://urbanjost.github.io/M_intrinsics/playground.html
The site was non-responsive so often I never finished it other than making a script that given a directory made a page (the page above is automatically generated). It is easy to link codes to your page in a similar manner? I think that would be useful for Fortran Wiki articles and other Fortran resources where examples could be loaded from the web page with a click. It is not as easy to do with other sites I tried so I never implimented that with another playground like the Goldbolt Compiler Explorer site.
Now you can do that, as explained here.
On trying the Fortran playground the LLVM Flang compiler rejected one of my own programs but I did not see the error message(s), so I can’t see what was wrong. I had tried the Compile and Run option.