XY graphing and plotting tool

 Grace is a point-and-click tool that allows the user to draw X-Y plots.
 This is the program formerly known as Xmgr.
 .
 A few of its features are: User defined scaling, tick marks, labels,
 symbols, line styles, colors, polynomial regression, splines, running
 averages, DFT/FFT, cross/auto-correlation, batch mode for unattended
 plotting, and hardcopy support for PostScript, FrameMaker and several image
 formats.