FramePad - Network protocol analyzer and monitoring tool for Windows 98/NT/2000/XP.
HiPing - HiPing - multithreaded ping utility.
IPCheck Server Monitor - Server Uptime/Downtime Monitor - alerts staff if a server or network is down
ipPulse - Monitor network devices and notify of problems via email, pager, web, logs
IPSentry Network Monitoring Suite - Monitor your network and its devices to receive notifications for problems.
MailTalkX - Spam filter software and email monitoring, filter email, auto forward mail.
MultiPing - Network monitoring tool w/ graphical results. Monitors multiple locations.
News Watch - Get only the news that you need.
Alchemy Network Monitor PRO - Monitors your LAN servers availability and performance, alerts on failures
PAL PC SPY - PAL PC Spy Protects, Controls and Monitors everything that happens on your PC.