DAD is a Windows event log and syslog management tool that allows you to aggregate logs from hundreds to thousands of systems in real time. DAD requires no agents on the servers or workstations. Correlation and analysis is driven through a web front end.
DAD Query Screen
Sample Alerts Interface
Project Members:
DAD relocated to Github many years ago. It has since been completely rewritten from the ground up: https://github.com/dhoelzer/DAD