1. Check nwc healthcheck_nwc_health is a plugin which checks the health of network components and interfaces.
2. Check oracle health A plugin (monitoring-plugin, not nagios-plugin, see also http://is.gd/PP1330) which checks various parameters of Oracle database servers. (We also offer trainings: http://www.consol.de/open-source-monitoring/schulungen/workshops/#datenbank-monitoring)
3. check mysql healthA plugin (monitoring-plugin, not nagios-plugin, see also http://is.gd/PP1330) which checks various parameters of MySQL database servers.
4. GLPluginPerl modules providing the basis for my Naemon plugins