Package plotutils

GNU vector and raster graphics utilities and libraries

http://www.gnu.org/software/plotutils/

The GNU plotutils package contains software for both programmers and
technical users. Its centerpiece is libplot, a powerful C/C++ function
library for exporting 2-D vector graphics in many file formats, both
vector and raster. It can also do vector graphics animations. Besides
libplot, the package contains command-line programs for plotting
scientific data. Many of them use libplot to export graphics

General Commands
Command Description
ode numerical solution of ordinary differential equations
plot translate GNU metafiles to other graphics formats
plotfont produce character maps of fonts supported by the plotting utilities
spline interpolate datasets using splines under tension
tek2plot translate Tektronix files to other graphics formats