Cuevision Server Monitor 2.5.5.2 (by Cuevision)
Server and network monitoring with alerting, recovery and reporting

Cuevision Server Monitor 2.5.5.2 (by Cuevision)
Server and network monitoring with alerting, recovery and reporting

GFI Network Server Monitor 7 (by GFI Software)
Monitors your network & servers for failures and fixes them automatically.

PA Server Monitor 3.3 (by Power Admin LLC)
Monitors event log, services, performance counters, disk space, web pages, etc.

Alchemy Network Monitor 8.5 (by M.I.S.Helpers)
Monitors your LAN servers availability and performance, alerts on failures

Alchemy Network Monitor PRO 8.5 (by M.I.S.Helpers)
Monitors your LAN servers availability and performance, alerts on failures

IsItUp Network Monitor 5.08 (by Taro Software Inc.)
IsItUp network monitor for servers, ports, websites, email w/ alerts & graphs

Advanced Host Monitor 6.54 (by KS-Soft)
Award-winning network monitoring software

IPSentry Network Monitoring Suite 5.0.30 (by RGE, Inc.)
Monitor your network and its devices to receive notifications for problems.

Simple Server Monitor 1.4 (by Cuda Incorporated)
An easy to use server monitoring tool. Monitor your servers from your desktop.

A1Monitor Network Monitor TCP or Web 6.1.70 (by A1Tech, Inc.)
Monitor multiple web or TCP servers (http, https, ftp, pop3 etc.)

Netoscope 1.6 (by Basta Computing, Inc.)
Netoscope: Internet server monitor.

The Dude 1.1 (by MikroTik)
The Dude will layout your network on a map and will monitor services of devices

Sniff-em Packet sniffer 1.12 (by YASC LTD)
Sniff-em 1.12 is a Windows based allround Packet sniffer and Network analyzer.

SNMPTest 1.03 (by Noel Danjou)
Query and monitor any SNMP-compatible device

MailMonitor 1.6.3 (by DigiArch.org)
If you have mail problems, MailMonitor shows you what's going on at port level.