Grace project is a WYSIWYG 2D plotting tool for the X Window System and Motif. Grace runs on practically any version of Unix-like OS. As well, it has been successfully ported to VMS, OS/2, and Win9*/NT/2000/XP (some minor functionality may be missing, though).

Here are some key features of "Grace":

General

· WYSIWYG design
· Convenient point-and-click graphical user interface
· Precise control of graph features
· True publication quality
· Graphs refresh almost instantly

Export Options

· Exports high-resolution graphics to (E)PS, PDF, MIF, and SVG formats
· Supports cross-platform PNM, JPEG and PNG formats
· Device-independent Type1 font rastering, including anti-aliasing, ligatures and kerning

Graphing Flexibility

· Unlimited number of graphs
· Unlimited number of curves on a graph
· Up to 256 customizable colors
· 9 dashed line styles
· 32 fill patterns
· 10 built-in marker symbols; plus, any character glyph from any font can be used as a marker
· Color/fill markers
· Text annotations with subscripts, superscripts, mixed fonts, styles and colors and more complex typesetting

Curve Fitting

· Linear and nonlinear least-squares
· Calculation and display of residuals
· Arbitrarily complex user-defined fitting functions, including dynamically loadable C/Fortran/... modules
· Fitting with constraints
· Region restrictions
· Fitting with arbitrary weight functions

Analysis Capability

· FFT
· Integration and differentiation
· Histograms
· Splines, including Akima splines
· Interpolation and smoothing
· Convolution, correlation, and covariation
· Sorting

Data Formats

· Unlimited data size; up to six dimensions plus an optional array of strings
· Reads text data input files
· Reads 1D netCDF files

Programmability

· Built-in programming language
· Math functions manipulate entire array
· Variables, including arrays (1D)
· User-definable functions via loadable modules
· All aspects of plot outlook can be programmed
· Controllable by external programs

Customization/Extensibility

· Dynamic module loading - write your own C/Fortran/...
· User-defined colors
· User-supplied fonts and encodings