PingPlotter Pro

From Nessoft:

PingPlotter Pro takes the features and benefits of PingPlotter Standard and adds a number of "industrial strength" features. PingPlotter Pro is built for the network professional who might need to monitor multiple targets simultaneously, run as a Windows service, or access PingPlotter remotely through a web interface. PingPlotter Pro also adds some features for the VoIP professional, with Jitter and MoS calculations, plus the ability to add user-defined metrics and calculations. Coupling this with a multi-target summary screen, workspaces, named configurations (and a whole lot more!), PingPlotter Pro is a powerful tool with a place in any administrator's toolbox.