1)   Colasoft Capsa Enterprise 6.8
Colasoft Capsa is an easy-to-use network analyzer (aka. protocol analyzer & packet sniffer) that performs real-time packet capturing, 24/7 network monitoring, advanced protocol analyzing, in-depth packet decoding, and automatic expert diagnosing.
sniffer, packet sniffer, protocol analyzer, network analyzer, packet decoding, network monitor, network diagnosing, network troubleshooting, packet capture, network traffic monitor,

 2)   AdventNet ManageEngine OpUtils 3.2
The AdventNet ManageEngine OpUtils is a comprehensive set of 40+ unique system and network monitoring tools. This web-based software helps IT administrators monitor, diagnose and troubleshoot their IT resources. OpUtils is web-based and very quick.
Network Utilities, System Utilities, Network Tools, Switch Port Mapping, Network Troubleshooting, Network Monitoring, CPU Monitor, Memory Utilization, Diagnostic Tools, Bandwidth Monitoring,

 3)   Easy Network Service Monitor 2.14
Easy to use and low cost tool for network, applications and services monitoring, fault identification, notification and reporting as well as service level agreement monitoring and reporting.
server, service level agreement, sla, network monitor, network applications, network availability, network troubleshooting, fault management, network management, network performance,