Fortran Wiki
NAG Fortran compiler
The NAG Fortran compiler is available at https://www.nag.com/content/nag-fortran-compiler. This commercial compiler fully supports the Fortran 2008 standard and supports a large number of Fortran 2018 features (in 2023). It also supports all OpenMP 3.1. It is available on Linux, Windows and macOS, including Apple Silicon Macs and Arm Linux systems.