1)   AdventNet ManageEngine OpUtils 4
The AdventNet ManageEngine OpUtils is a comprehensive set of 45+ 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,

 2)   Advanced Host Monitor 7.20
HostMonitor is a system management tool that continuously monitors servers availability and performance. It has 60 test methods, 30 alert methods, highly flexible report and log manager. Package includes Log Analyzer, Web Service and other utilities.
monitor, network monitor, LAN monitor, host monitor, IP monitor, snmp monitor, web monitor, cpu monitor, SQL Monitor, advanced monitor,

 3)   Network Traffic Monitor (NetTraffic) 1.8
NetTraffic v1.8 - This free program plots in realtime all data sent and received via all your TCP/IP Network adaptors. Shows separate sent, received, send rate, received rate, peaks and totals. Five graphs and statistics. Animated System Tray Icon.
Modem Monitor, Monitor, Graph, DialUp, Clock, Wallpaper, Performance, CPU Monitor, Alarms, MP3 Player,

 4)   Performance Monitor 3.8.5
Monitor your CPU, Memory, Disk and Network utilization with this very useful program
Performance Monitor, CPU Monitor, Disk Monitor, Network Monitor, Memory Monitor,

 5)   DEKSI Network Analyzer 6.0
An advanced, powerful, and feature rich network mapping, monitoring, management, and administration software solution.
network monitor, server monitor, network traffic monitor, network bandwidth monitor, network server software, network administration, networking, network management, LAN monitor, host monitor,