Orion Network Performance Monitor 8.5 (by SolarWinds)
Free trial: server-based fault, bandwidth and network performance management

TFTP Server 9.1 (by SolarWinds)
Multi-threaded TFTP server used to upload/download executable images and configs

Engineer's Toolset 9.0 (by SolarWinds)
Includes 47 network diagnostic and analysis tools directly from the desktop.

Cirrus Configuration Manager 3.5 (by SolarWinds)
Solution designed to streamline and automate network configuration management.

Advanced Subnet Calculator 8.0 (by SolarWinds)
SolarWinds Calculator creates all subnets with CIDR, real-time DNS & PING tests.

Engineers Toolset 9.1 (by SolarWinds)
Includes 49 powerful desktop tools for diagnosing and fixing network problems

Engineer's Toolset 9.0 (by SolarWinds)
Includes 47 network diagnostic and analysis tools directly from the desktop.

Engineers Edition 3.3 (by SolarWinds.Net)
Over 38 Network Discovery, Monitoring, Router and Management tools in 1 package

Professional Edition 5.2 (by SolarWinds.Net)
A collection of over 30 Network Discovery, Monitoring and Management tools.

AdventNet ManageEngine OpUtils 3.2 (by AdventNet Inc.)
Comprehensive,Web-based and Quick Troubleshooting Tools for IT Administrators

SolarWinds Professional Toolset 8.2 (by SolarWinds.Net)
A collection of over 30 Network Discovery, Monitoring and Management tools

XR SNMP Tools 3.5 (by XRatel Software)
Set of high performance tools for monitoring network SNMP manageable devices.

SolarWinds Professional Toolset 8.2 (by SolarWinds.Net)
A collection of over 30 Network Discovery, Monitoring and Management tools

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

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

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.