AdventNet EventLog Analyzer Free Edition 

EventLog Analyzer is a web-based event management tool that collects, analyzes, and reports on event logs from enterprise-wide Windows and UNIX systems.
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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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EventTracker for Windows 

EventTracker tracks all events of Windows NT/2000 systems of your network at central location. It displays all the events in real time and logs events into a database
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