gnuplot plots 2d and 3d graphs, from a data file or with a formula. It has an interactive mode with online help, or it can be used non-interactively. gnuplot does function fitting to data sets, and it does output to many terminals, among which are PostScript, X11 display, PNG, and GIF (via the old gd library).
Release Notes: A regression that caused color specification "lc N" to fail has been fixed. A long-standing clipping error in plots with filled curves has been fixed. A segfault if a "refresh" command follows an interrupted replot has been fixed.
Release Notes: This version is a major release with significant new capabilities and enhancements compared to the 4.2 releases. Particularly noteworthy features include smoother graphics, better internationalization, support for transparency and alpha-channel, and the new plot styles circles and rgbalpha.
Release Notes: Text strings can be read and manipulated as normal data. There is a new interactive terminal based on wxWidgets, pango, and cairo. New 2D plot styles 'histogram', 'labels', 'image', and 'rgbimage'. New 3D plot styles 'labels', 'vectors', 'image', and 'rgbimage'. User control over color definitions and color use in plots. Improved font handling and text formatting. New syntax to handle string variables and string functions. Creation of animated GIF sequences. Support for UTF-8 and other multi-byte font encodings. Japanese language documentation and internal help.
Release Notes: This release features half a dozen new output drivers, two completely new plotting styles (pm3d, filledcurves), an almost unbelievable number of small and large feature extensions, and some serious changes to the command language. GUI plot windows now interact via mouse and hotkeys, and boxes can be filled. A wholesale reorganization of the code structure was performed and many bugs were fixed.
Release Notes: Most, if not all, known bugs have been fixed. This will most likely be the final release in the 3.7 series, apart from another one or two possible bugfix releases.