BitMeter 3.5.1 (by Codebox Software)
Graphical Bandwidth Meter with many features

BitMeter 3.5.1 (by Codebox Software)
Graphical Bandwidth Meter with many features

DunStats 1.0 (by Camtech 2000)
Monitor everything you always wanted to know about your Internet Connection

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

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

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

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

Emsa Bandwidth Monitor 1.0.44 (by EMSA SYSTEMS LTD)
Emsa Bandwidth Monitor - Net speed monitoring utility for Windows. Freeware.

iNetCalc 2.59 (by DeSofto)
Internet connection speed meter and bandwidth monitor with ad-banners filter.

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

BBMonitor 1.2.3 (by Absolute Futurity)
Bandwidth speed test meter and monitor, stores bandwidth results in a database

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.