>My other question is: to what extent the Sage++ can handle
>Fortran 90 syntax ? 
we have a version that handles many f90 features (including
free format, etc), but it is not public yet.  we also
have a new f90 parser coming soon from another group
that will handle the full f90 spec.   
as you have noticed much of the current distribution is
aimed at f90, but this is not all there yet.
we will be getting the next release out this summer.
if you need the f90 sooner, we can try to give you an alpha