...The gnuplot editor generates a preview of the plot for every change you make and quickly allows to show the created image file with a simple keystroke. Lines with errors are highlighted in the code and gnuplot output is shown in a separate widget.
In addition it features all basic editor options, syntax highlighting and menu macros for often used gnuplot options.
The program is written in python (works with 2 and 3) with a Qt4 user interface, which makes it platform independent (tested in Linux, OS X 10.7 and Windows XP).
You must have gnuplot installed to run this program. The debian package was build with Ubuntu 12.10.