Fortran editor/compiler

Anyone know where I can find an editor with build in compiler for Fortran.

I have a job converting a Fortan program to C# and would like see how the Fortran code is working.

Or maybe a Fortran 3 C# converter.

this might help although ive never tried any of these:

http://www.thefreecountry.com/compilers/fortran.shtml