Cuevision Server Monitor 2.5.1.3 (by Cuevision)
Server and network monitoring with alerting, recovery and reporting

Cuevision Network Monitor Professional 2.2.2 (by Cuevision)
Server, website and network monitoring software with alerting, recovery and repo

Cuevision Network Monitor Professional 2.2.2 (by Cuevision)
Server, website and network monitoring software with alerting, recovery and repo

IsItUp Network Monitor 4.9.8.1 (by Taro Software Inc.)
IsItUp network monitor for servers, ports, websites, email w/ alerts & graphs

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

PMP 7.3.1 (by Eastbow Lab)
Performance monitor for remote/multiple Windows servers.

IPSentry Network Monitoring Suite 4.7.0 (by RGE, Inc.)
Monitor your network and its devices to receive notifications for problems.

IPSentry Network Monitoring Suite 5.0.20 (by RGE, Inc.)
Monitor your network and its devices to receive notifications for problems.

IT Monitor 3.0 (by CBR Software)
IT Monitor is the leading solution for monitoring LAN, WAN and Applications

Alchemy Network Monitor 8.0 (by M.I.S.Helpers)
Monitors your LAN servers availability and performance, alerts on failures

Alchemy Network Monitor PRO 8.0 (by M.I.S.Helpers)
Monitors your LAN servers availability and performance, alerts on failures

Monitor Wolf 1.52 (by Lone Wolf Software)
Monitoring software that watches your website and measures i'ts performance.

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.