GtkPlot
GtkPlot is a widget for GTK+. It allows to draw high quality scientific plots in two dimensions with a look and feel very similar to Microcal Origin for Windows. The distribution includes GtkPlotLayout, a simple GtkLayout subclass, and a demo program showing two layered plots with different kind of curves. You can choose between a number of symbol types, lines, connectors -straight lines, steps, splines-, and change their attributes -color, size, width-. You can also plot functions, add error bars, edit legends, rotate and move axis titles, change axis properties, etc.
GtkPlot-2.x includes a GtkPlotCanvas widget which allows DnD plots, points, and child objects (text, axis titles). You can move them or resize your plots dragging with the mouse!
GtkPlot-3.x includes a PostScript driver.
You can download the package from:
ftp://ripley.ifir.edu.ar/pub/gtk
This library is distributed under the LGPL License.