rrdtool
SmokePing
https://oss.oetiker.ch/smokeping/
SmokePing is a deluxe latency measurement tool. It can measure, store and display latency, latency distribution and packet loss. SmokePing uses RRDtool to maintain a longterm data-store and to draw pretty graphs, giving up to the minute information on the state of each network connection.
Added 10 months ago
MRTG - Tobi Oetiker's MRTG - The Multi Router Traffic Grapher
http://www.mrtg.org/mrtg
You have a router, you want to know what it does all day long? Then MRTG is for you. It will monitor SNMP network devices and draw pretty pictures showing how much traffic has passed through each interface.
Added 13 years ago
Munin - Trac
http://munin-monitoring.org/
Munin is a networked resource monitoring tool that can help analyze resource trends and "what just happened to kill our performance?" problems. It is designed to be very plug and play. A default installation provides a lot of graphs with almost no work.
Added 13 years ago