MonAMI: your friendly monitoring daemon. The MonAMI project is to build a simple monitoring daemon that supports multiple plugins. The core daemon mediates the flow of information whilst plugins provides rich functionality.
MonAMI is a great tool which supports the monitoring of resources, then sends the metric information off to other tools such as Nagios or Ganglia, or even to flat files or a MySQL database. The best thing about MonAMI is that is reads from the service only one during a configurable interval, then uses the cached information to satisfy requests. This results in reduced load on monitored resources.