Interactive fortran environments (a la Jupyter)
Such as LFortran + Jupyter-Lab? 
… but there’s some way to go to make it suitable for classrooms and plotting in this environment is key.
stdlib already includes some procedures like loadtext. Ongoing development of stdlib on the io end will help cross more io-related barriers. NetCDF and HDF are fairly easy to handle with Fortran and fairly well documented. The main barrier I can see here is for people to get together all their tools with minimal hassle.
Agree. Expanding the stats modules would be a priority for the sort of things I teach.
So … we’re not quite there yet, but well on the way I think.