IPCheck Server Monitor 5.3.1.586 (by Paessler AG)
Server Uptime/Downtime Monitor - alerts staff if a server or network is down

Bello Network Monitoring WinGUI 5.3.1.587 (by Paessler AG)
Monitoring for your websites and servers - easy to use and cost effective

PRTG - Paessler Router Traffic Grapher 5.3.0.833 (by Paessler AG)
Monitor and classify bandwidth and network usage. Easy to use Windows software.

Webserver Stress Tool 7.1.1.229 (by Paessler AG)
Webserver load, performance and stress test simulates simultaneous server users.

Paessler SNMP Tester 2.2 (by Paessler AG)
Test and debug SNMP requests against a device in your network.

PRTG - Paessler Router Traffic Grapher 5.3.0.833 (by Paessler AG)
Monitor and classify bandwidth and network usage. Easy to use Windows software.

PRTG - Paessler Router Traffic Grapher 5.2.0.581 (by Paessler AG)
Monitor and classify bandwidth and network usage. Easy to use Windows software.

Bandwidth Meter Pro 2.1.0.491 (by BANDWIDTH-METER.NET)
An easy to use network software for bandwidth usage monitoring and reporting.

MZL & Novatech Traffic Statistics 1.2.0.1 (by MZL & Novatech TrafficStatistic)
DSL traffic statistics and IP bandwidth usage reporting cut by host and service

MZL & Novatech Traffic Statistics 1.2.0.1 (by MZL & Novatech TrafficStatistic)
DSL traffic statistics and IP bandwidth usage reporting cut by host and service

MZL & Novatech Traffic Statistics Linux Server 1.2.0.0 (by MZL and Novatech Traffic Statistics)
IP traffic statistics and bandwidth usage reporting cut by host and service

Network Traffic Multi Optional Report 1.2 (by MZL & Novatech TrafficStatistic)
Query traffic statistics cut by local host's, target machines and services

Traffaret 1.0 (by Trian Software)
Traffaret is the easy to use tool that monitors bandwidth usage.

JDSoft Bandwidth Manager 1.0 (by JDSoft)
control and monitor network bandwidth by applying rules(filters)

NetWorx 3.2 (by SoftPerfect Research)
Measure your bandwidth use and the speed of all kinds of network connections

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.