Traffic Monitoring Tools

What is Splunk?
Splunk captures, indexes and then correlates data in a searchable repository from which it can generate reports, graphs, alerts, visualization and dashboards. Considered as one of the best security tool, the sheer power of this thing is incredible. It can scale endlessly and also has the ability to cluster.

Is Splunk Free?
A commercial version is available. Free versions may also be offered.

Does Splunk Work on all Operating Systems?
Works natively for Linux and MAC OS X.

What are the Typical Uses for Splunk?
Splunk is used to search, monitor, report and analyze real time streaming and historical IT data. It can collect logs from different sources and make them searchable in a unified interface.