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.

Paessler Netflow Tester 1.1 (by Paessler AG)
Debug bandwidth monitoring configurations based on Cisco's Netflow protocol.

NetFlow Configurator 1.0 (by SolarWinds)
Remotely and quickly configuring NetFlow v5 via SNMP on supported Cisco devices.

Orion Netflow Traffic Analyzer 2.2 (by SolarWinds)
Free trial software analyzes NetFlow data, examines bandwidth consumption trends

Scrutinizer NetFlow analizer 2.1 (by Plixer International)
Use Netflow to find out what protocols are on your network

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

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

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

Cert CCNA Router Simulator 2.0 (by Anand Software and Training (P) Ltd.)
CertExams.com simulator provides router console and many lab exercises for CCNA.

Router Tester 1.01 (by Noel Danjou)
Helps DynSite users to accurately identify the HTML status page of their routers

CertExams.com CCNA Network Simulator. 2.0 (by Anand Software and Training (P) Ltd.)
CertExams.com simulator provides network simulator with designer for CCNA.

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.