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Complete monitoring and alerting for servers, switches, applications, and services.
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Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
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Cacti is a complete network graphing solution. It provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features.
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Icinga is a fork of Nagios and is backward compatible.
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A fully featured network monitoring system that provides a wealth of features and device support.
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PnP networked resource monitoring tool that can help to answer the what just happened to kill our performance.
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FastNetMon is a very fast DDoS analyzer with sflow/netflow/mirror support.