First let me say I’m not a big Fortran user but any blog posts about Fortran always seem to be very popular, and I do get asked regularly about how to compile Fortran applications. So when I saw that the NNSA, national labs team with Nvidia to develop open-source Fortran compiler technology to integrate into LLVM I thought I'd mention it.

LLVM is a collection of reusable compiler and tool chain technologies with a modular design that facilitates support for a wide variety of programming languages and processor architectures.The Fortran front-end module created through this project will be derived from NVIDIA’s PGI Fortran compiler, which has been used in production across a variety of high performance computing systems for more than 25 years. PGI® software is a leading supplier of software compilers and tools for parallel computing.

I've compiled a list of Fortran resources for the Mac here.