We started to work on a Fortran parser: https://github.com/NicolasAnquetil/VerveineF.git
Because it's easiest for us, we are using the Eclipse parsing infrastructure (project Photran)
The parser is in a VERY preliminary version as it only recognizes function declarations and calls
Famix will also have to be adapted to Fortran ...
It is released under MIT licence
have fun
nicolas