At your web site, you say that you would welcome a review of
NAS FortranPlus.   I can only comment on the Windows version;
I do not use Linux.

NAS FortranPlus is a full F95 compiler, with some F200X features.
The current version (2.2) seems to be very reliable.   I have not found
any bugs in this version, though I found quite a number in version 2.1.
It is particularly intolerant of most non-standard extensions to Fortran,
and reports on obsolete Fortran features which were removed in F95,
though I think it still supports most of them.   The Windows version
supports
10-byte reals; I expect that the linux version does also.

One very handy feature for me is that the compiler sets up a project.
If it finds a USE statement in a file, it remembers it - you do not need to
link in lots of .OBJ files for all of the modules you use.    f95 main.f90
finds them for you.   Lahey's LF90 used to do this as well, but neither
the Lahey/Fujitsu LF95 nor Compaq does this for you.   Of course,
you can set up make files to do this for you - NAS effectively does it
for you.

The compiler can be downloaded for a free 30-day trial.

The company seems to be very small, and service is extremely slow.

Fortran 200X features supported include:
+ Extended functionality for allocatable arrays.   They can be passed as
   dummy arguments, the result of a function can be an allocatable array,
   and a structure component can be allocatable.
+ Fortran and C inter-operability according to the draft F200X standard.
+ Type aliasing.
+ ISO Varying String and Varying attribute.

It is the cheapest F95 compiler.

Alan Miller (Honorary Research Fellow, CSIRO Mathematical &
 Information Sciences).
http://www.ozemail.com.au/~milleraj
http://users.bigpond.net.au/amiller/