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.

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

IPCheck Mobile GUI 2.02 (by Paessler AG)
Server Uptime/Downtime Monitor for PocketPC - know when a server/network is down

Bello Network Monitoring WinGUI 5.0.1.231 (by Paessler AG)
Monitoring for your websites and servers - easy to use and cost effective

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

Server Website Monitoring Tool 2.1.0.8 (by Web Services)
Network server IP ping internet connection speed downtime monitoring software

WebWatchBot Website Monitoring Software 4.0.3 (by ExclamationSoft)
Website Monitor Software for Websites and IP Devices with Charting and Reporting

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

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

TheOne Server Monitor Pro 2.5.0 (by TheOne Software Corporation Limited)
TheOne Server Monitor Pro can monitor Website, Email, Database, Network & Server

Network Eagle Monitor Pro 4.4 (by Effective Systems Ltd.)
Network Eagle: Powerful network monitoring and alerting software.

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.