Graphical Ping Plotter, similar to Perfgraph?

Solution 1:

I have a nice CLI solution - it's called mtr. It's installable via homebrew or ports.

Here is a screenshot:

text interface mtr

Solution 2:

Nagios does install with ports on MacOS X.

Have a look at these performance graphs.

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I must quote here the final message of Nagions installer:

But Nagios is a complex program so you should read the documentation online at http://www.nagios.org or locally at /opt/share/nagios/docs/index.html to fully understand Nagios.