Net Meter 3.1.0.249 (by Hoo Technologies)
Monitors network connections traffic and displays real-time details.

Bandwidth Monitor 2.9.0.623 (by BWMONITOR.COM)
Monitor your WAN and LAN bandwidth and display real-time data transfer rates.

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

SoftPerfect Traffic Meter 2.0 (by SoftPerfect Research)
Create a full-featured system for monitoring the Internet usage on your network

Bandwidth Vista 1 (by Bandwidth Vista)
Bandwidth Vista is a modern bandwidth meter, informative and intuitive to use.

BWMeter 2.5.2 (by DeskSoft)
BWMeter is a powerful bandwidth meter, monitor and traffic controller.

Cymphonix Speed-O-Meter 4.1 (by Cymphonix)
Speed-O-Meter monitors your Internet speed in real time.

Crystal Internet Meter 2.0 (by Crystal Art Software)
Use your Internet bandwidth to the fullest!

CommTraffic 3.0 (by TamoSoft)
A program for collecting, processing, and displaying traffic statistics.

IP Traffic Monitor 2.2 (by Skyward Software)
Monitor all your network connections in real-time or browse historical reports.

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.