Nagios is the answer!
It is licensed under the terms of the GNU General Public License Version 2 as published by the Free Software Foundation.
Nagios is a powerful system and network monitoring application. It monitors hosts and services specified, alerting administrators when threshold triggered, and when they recover to healthy state.
Nagios is only available in Linux or UNIX variants. Although, it could helps to monitor Windows servers as well via the Windows version of Nagios client.
Nagios features:- Monitors network services such as SMTP, POP3, HTTP, NNTP, PING, etc.
- Monitors server resources such as processor load, disk usage, etc.
- Simple plugin design that allows users to easily customize own service checks.
- Parallelized service checks.
- Ability to define network devices hierarchy using "parent" hosts, allowing detection of and distinction between network devices that are down and those that are unreachable.
- Notifications to contacts of email, pager, or user-defined method, when service or host status change.
- Ability to define event handlers to be run during service or host events for proactive problem resolution.
- Automatic log file rotation.
- Support for implementing redundant monitoring hosts.
- Optional web interface for viewing current network status, notification and problem history, log file, etc.
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