gnuplot是一套跨平台的数学绘图自由软件。使用交互式接口，可以绘制数学函数图形，也可以从纯文本档读入简单格式的座标数据，绘制统计图表等等。它不是统计软件，也不是数学软件，它纯粹只是一套函数／数据绘图软件。它可以产生PNG，SVG，PS，HPGL，……等等开放的图形文件格式的输出，供文字处理／演示文稿／试算表／……等等软件导入。

gnuplot是有版权的，但自由分发；无须付费。

功能：

gnuplot is a command-line program that can generate two- and three-dimensional plots of functions, data, and data fits. It is frequently used for publication-quality graphics as well as education. The program runs on all major computers and operating systems (GNU/Linux, Unix, Microsoft Windows, Mac OS X, and others). It is a program with a fairly long history, dating back to 1986. Despite its name, this software is not distributed under the GNU General Public License (GPL), but its own free software license.