NewRelic - New Relic is a Software Analytics company that makes sense of billions of metrics across millions of apps. We help the people who build modern software understand the stories their data is trying to tell them.

NetSpeedMonitor - NetSpeedMonitor is a lightweight Network Monitoring Toolbar for your Windows Taskbar

Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.

TrafficMonitor - TrafficMonitor is a network monitoring suspension window software in Windows.

Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.

FreeMeter - Monitor network bandwidth (C#.NET 2k/XP+). Desktop and Systray graph.