Abusix - Abusix is a network security company that offers email threat protection and network abuse handling solutions to ISPs, Telcos, and Cloud/Hosting Providers to stop the rapidly growing problem of email-borne threats and other kinds of network abuse.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
Easy-IP - IPAM and DNS for Telecoms
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.
nChronos - NPMD key player, provides network analysis, monitoring, diagnosis and troubleshooting solutions for network performance improvement and network forensics.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services