EventTracker 

Consolidate and correlate event log information from Windows, Unix, Linux and SNMP devices to a central console so that alerts and reports can be generated, in accordance with user defined policy
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GFI LANguard Security Event Log Monitor 

Performs event log based Intrusion detection and network wide event log management. Archives & analyses event logs of all network machines and alerts you in real time to security issues, attacks and other critical events.
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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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