| Cgraph - PostScript plotting library in C |  | CGraph is a set of C functions that generate PostScript or Encapsulated PostScript for publication quality scientific plots.  Output color or B&W easily. Many different plots scales including log-log.  Works with any C compiler.  Freeware.  (Aug 1999) | 
| Flounder - 4-D data visualization |  | Flounder is a program to quickly visualize 4D data (x,y,z,t).  It can produce isosurfaces, solid renderings, as well as 2D slices.  Output options include PNG, GIF, and AVI files.  Open Source.  Unix/Win32  (Apr 2001) | 
| GnuPlot |  | Gnuplot is a command-line driven interactive function and data plotting utility for UNIX, MSDOS, and VMS platforms.  It supports 2-D and 3-D plots including curves and sufaces.  Includes complete source in C.  (Feb 1998) | 
| Guppi - app for graphing and statistical analysis |  | Guppi is an easy-to-use graphical interface for plotting data and performing statistical manipulations.  It is a GNOME application, and is available from GNOME CVS.  Freeware  (Jul 1999) | 
| mathplot - interactive/batch function grapher |  | mathplot is a GUI frontend for interactive graphing of functions to XWindows.  You can have both equations (y=f(x) or f(x,y)=g(x)) and inequalities Postscript output is available.  Freeware.  (Jul 1999) | 
| PGPLOT - Graphics Subroutine Library |  | PGPLOT is a Fortran or C callable, device-independent graphics package for making simple scientific graphs.  Supports laser printers, pen plotters, PostScript, and GIF.  Supports most Unix and Win32.  Freeware for noncommercial use.  (Aug 1999) | 
| Books about Graphing |  | A complete list of books on Graphing available through Amazon.COM |