Smokeping not only checks the availability of various servers and services but also keeps track of their latency while providing easy to use, nice looking, and quick to display graphs.

Wide range of latency measurement plugins is available out of the box. If you know some Perl, it is easy to create your own ones for any exotic needs.

Large installations will benefit from Master/Slave System for distributed measurement.

Highly configurable alerting system will help you notice issues before they start affecting users or evolve into major outage.

Smokeping is free and OpenSource Software written in Perl by Tobi Oetiker, the creator of MRTG and RRDtool