FTN95 includes ClearWin+ and that makes it easy to produce complex graphics -- Simdem makes it even easier! Simdem is a graphical library built on ClearWin+ that lets you produce complex graphs and plots in a few lines of Fortran. What is more, Simdem is free.
Easy - Just link in the library and away you go
Free - No licence required to use the library
Source Code - You can build the library yourself if you want to.
Examples - Simdem comes with a suite of examples.
Output - Plots can be sent to a printer or converted to Postscript.