For an example of use in production, my business [0] is built around running ~1M lines of parallel Fortran (public domain code) in the cloud. There are many many other uses but tend to be less visible -- under the hood of other software, banking systems, many DOE and DOD projects etc.
In addition to being fast, I find it considerably easier to read than C++ as it isn't as low level and doesn't have as much noise (at least the later versions like Fortran 90).
It also makes writing numerical code easy as it was truly built for high performance scientific computing.
A lot of older scientific projects run on Fortran and although I know some projects that were migrated to C++, it wasn't due to any defect from the language besides it not being taught very often in colleges now outside of some astrophysics classes where it was once a mainstay in engineering and science curriculums.
There are several compilers available, but a lot of them are commercial and some are expensive. There are free versions as well of course.