Nagios is a powerful, enterprise-class host, service, application, and network monitoring program. Designed to be fast, flexible, and rock-solid stable. Nagios runs on *NIX hosts and can monitor Windows, Linux/Unix/BSD, Netware, and network devices.
System Requirements
Operating System: Cygwin (MS Windows), Fink (Mac OS X), All 32-bit MS Windows (95/98/NT/2000/XP/Vista/7), POSIX (Linux,BSD,Solaris etc..), BSD