PGPLOT Graphics Subroutine Library - Fortran and C-callable, device-independent graphics package for making simple scientific graphs. - http://www.astro.caltech.edu/~tjp/pgplot/
NCAR Graphics - Fortran and C based software package for scientific visualization. - http://ngwww.ucar.edu/
gnuplotfortran - An API for gnuplot for Fortran 95. It uses kernel IPC, and uses fortranposix. [Open source, LGPL] - http://gnuplotfortran.sourceforge.net
PSPLOT - Free Fortran-callable PostScript plotting library, by Kevin E. Kohler. - http://www.nova.edu/ocean/psplot.html
F90gl - Fortran interface for OpenGL, an environment for developing portable, interactive 2D and 3D graphics applications, and GLUT. - http://math.nist.gov/f90gl/
Plot88 - Graphical library of more than fifty subroutines that produce publication-quality drawings to printers, display adapters and as Postscript, CGM, and AutoCAD DXF files. Source code available. - http://www.plotworks.com/
MATFOR - A set of Fortran numerical and graphical libraries empowering users with run-time animation, contour plots, surface plots for gaining insights into your computation. [Shareware, 30 days trial] - http://www.ancad.com/
GKS for Microsoft Windows - Graphics library for QuickWin programs using Compaq Visual Fortran. - http://www.fpp.uni-lj.si/~milanb/gks/
DXFortran - Freeware graphical library in DXF (Drawing Interchange Format) format for Fortran 90 programmers. - http://w3.ualg.pt/~csilva/