IPD LAN Manager 2.1 (by IP Detective)
Track all traffice on your network

IPD Personal with e-mail alert 2K 2.2 (by IP Detective)
IPD Personal will notify you via e-mail of any changes in your IP.

IP Detective Suite 2K 2.2 (by IP Detective)
IP Detective Suite is an all encompassing IP monitoring and logging program.

IPD Personal XP 2.1 (by IP Detective)
Recieve email when your ip address changes.

IP Desktop Viewer XP 2.1 (by IP Detective)
Display your current external ip address on your desktop.

Netoscope 1.6 (by Basta Computing, Inc.)
Netoscope: Internet server monitor.

The Dude 2.1 (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 1.7 (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.