Open Monitor is an Open Source network monitoring software for the Windows operating system. It comes with the option to monitor multiple local and remote servers and notify the system administrator if services or programs are not accessible.
The main interface of the monitoring software is divided into a quick server check option at the bottom which can be used to check if services such as HTTP, FTP or POP are running on a IP or domain. The networking monitoring software will automatically display the results in the same interface. Probably more interesting than the quick check function is the option to add servers permanently to the monitoring tool.
The user needs to enter a server name which is used for identification and a server address which is usually an IP address. A list of services are preselected and will be checked unless unchecked by the user. Alerts can be enabled or disabled in the same interface as well. These do have to be configured separately and can inform the user by email, screen message, executing a program or playing a sound.

There is also the possibility to add http url checks next to the default services that can be monitored by Open Monitor. This allows a user to specify an url, port, alerts and words that the page should include or exclude. This can be used for example to verify that a page is up by checking for a word on that page that is always appearing. Can also be used to run scripts that output a simple message in the end, e.g. a database check that is displaying ok if the database is up and running.

Open Monitor is a straightforward, easy to use, network monitoring software that can monitor popular services. Alternative programs are the server monitoring software IT Service View, Newt, the website monitoring software SiteMonitor or the Microsoft Network Monitor.
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Take a look at http://www.monitorSNMP.com – free on-demand network monitoring service (SaaS) from Monitis. Currently very basic but has an impressive roadmap. First hosted network monitoring as far as I know.
How does this compare with GroundWork Monitor?
GroundWork Open Source uniquely combines the most mature and successful open source network monitoring tools available today into a single package. These amalgamated projects have been downloaded over the last decade for more than 4 million times and have a strong codebase and a strong community behind them.