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 Graph visualisation
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General view
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  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
    Home page.