Mandela!

Gnuplot is a portable command-line driven interactive data and function plotting utility. It was originally intended as to allow scientists and students to visualize mathematical functions and data. It does this job pretty well, but has grown to support many non-interactive uses, including web scripting and integration as a plotting engine for third-party applications like Octave. Gnuplot supports many types of plots in either 2D and 3D. It can draw using lines, points, boxes, contours, vector fields, surfaces, and various associated text. It also supports various specialized plot types. »

ksar is a sar graphing tool that can graph for now linux,mac and solaris sar output. sar statistics graph can be output to PDF or jpg/png/csv/txt.

Timeplotters are command-line tools for visualizing temporal data, especially useful for visualizing data from ad-hoc program logs to help you spot patterns and anomalies that you would not spot otherwise (by just watching how the program works, or by looking at the logs with the naked eye).

Autograph is a dynamic PC program operating in 3 modes:

Is a powerful, easy-to-use, equation plotter with numerical and calculus features: