iftop - iftop does for network usage what top(1) does for CPU usage.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
darkstat - darkstat is a packet sniffer which runs as a background process, captures network traffic...
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.
ntop - ntopng High-Speed Web-based Traffic Analysis and Flow Collection ntopng is the next generation version of the original ntop, a network traffic probe that monitors network usage. ntopng is based on …
Dynatrace - Cloud-based quality testing, performance monitoring and analytics for mobile apps and websites. Get started with Keynote today!