Wikipedia
NetCrunch
AdRem NetCrunch is a commercial software product for agentless, cross-platform network monitoring developed by AdRem Software, Inc. The program monitors 65 network services, Windows applications; Windows, Linux, NetWare, BSD, Mac OS X systems and SNMP (v1-3) devices without agents; centralizes fault management by collecting and alerting on events from sources including Windows Event Log, syslogs, and SNMP traps; presents physical and logical network topology as automatically updated dynamic graphical views.