TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
Zabbix - Track, record, alert and visualize performance and availability of IT resources
TcpView For Linux - TcpView For Linux. Touch screen friendly design graphical network connections viewer for Linux.
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.
NetStat Agent - At whatever point you open a site association through your program or download documents, you are opening TCP/UDP connions.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services