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* General view.

  http://en.wikipedia.org/wiki/List_of_graphing_software

* RRDtool.

RRDtool is the OpenSource industry standard, high performance data logging and

graphing system for time series data. Use it to write your custom monitoring

shell scripts or create whole applications using its Perl, Python, Ruby, TCL

or PHP bindings.

  http://oss.oetiker.ch/rrdtool/

                home page

* Graphviz.

Graph visualization is a way of representing structural information as

diagrams of abstract graphs and networks. Automatic graph drawing has many

important applications in software engineering, database and web design,

networking, and in visual interfaces for many other domains.

  http://www.graphviz.org/

                home page

* Gnuplot.

Gnuplot is a portable command-line driven graphing utility for linux, OS/2, MS

Windows, OSX, VMS, and many other platforms.

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.

Gnuplot supports many different types of output: interactive screen terminals

(with mouse and hotkey input), direct output to pen plotters or modern

printers, and output to many file formats (eps, fig, jpeg, LaTeX, metafont,

pbm, pdf, png, postscript, svg, ...).

  http://www.gnuplot.info

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