PingStat
This is a ping utility that sends ping messages to any server of your choice. You can see the ping times as well as a graph representing the trend (up or down) of how fast the pings are returned. This ...
Cost: $7
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Trial version
Publisher: HotWare 
Descriptions
PingStat:
This is a ping utility that sends ping messages to any server of your choice. You can see the ping times as well as a graph representing the trend (up or down) of how fast the pings are returned. This can give you an idea of network congestion, whether a process that began running at a certain time affects bandwidth of a particular area of your network or a particular server.
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