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* 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