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.

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

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.

Network Probe 1.2.3 (by ObjectPlanet, Inc.)
Network monitor and protocol analyzer

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

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

Colasoft EtherLook 1.0 (by Colasoft Co., Ltd.)
An easy to use TCP/IP network traffic monitor for the Windows-based platforms.

Traffic Counter 2.0.017 (by DigitByte Studio)
It can display and count network traffic of your computer.

Netjini Plus Traffic Analyzer 2.0 (by CBR Software)
Network Traffic Analyzer and Usage Reporter.Remote LAN,WAN support.Real Time

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.