rrdtool

RRD stands for Round Robin Database. RRD is a system to store and
display time-series data (i.e. network bandwidth, machine-room temperature,
server load average). It stores the data in a compact way that will not
expand over time, and it presents useful graphs by processing the data to
enforce a certain data density. It can be used either via simple wrapper
scripts (from shell or Perl) or via frontends that poll network devices and
put a friendly user interface on it.

          

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License: GPL-2.0+ AND LGPL-2.0+
URL: http://oss.oetiker.ch/rrdtool/