gmFortran is a translation tool which we customize for our clients to fit their specific Fortran-to-C migration requirements and re-architecting standards. It is a product that we license to clients for self-service use.
We use this tool to do custom migrations for clients. We also use it to do migration assessments for potential clients. Actually, most of the time we use it to convince potential clients that the tool does work and it does produce C translations that are both correct for the target platform and also readable for long-term maintenance by a typical C programmer.
The free assessment includes the following steps:
Request a Fortran to C Migration Assessment