CheckSpace 

CheckSpace monitors free space on your hard drives, the used space for directories, the NT event log, Dr. Watson errors, applications, CPU usage, files or websites. It creates reports and on WinNT/2000 the program runs as a system service.
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LogWatcher 

LogWatcher is an advanced utility designed to search through Windows NT event logs to find certain keys that you define, and to execute special tasks when it finds them. LogWatcher also supports text-based event logs.
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DEKSI Network Monitor 

DEKSI Network Monitor is an advanced, powerful, and feature rich tool that monitors servers located on your LAN, WAN, and the Internet. Windows 9X, NT, 2000, XP, 2003 Server compatible and can monitor the servers with any operating system.
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