NRPE

NRPE allows you to remotely execute Nagios plugins on other Linux/Unix machines. This allows you to monitor remote machine metrics (disk usage, CPU load, etc.). NRPE can also communicate with some of the Windows agent addons, so you can execute scripts and check metrics on remote Windows machines as well.

Latest Version: 2.12 (03/10/2008)

NRPE 2.12 All versions (SourceForge) Documentation

NSCA

NSCA allows you to integrate passive alerts and checks from remote machines and applications with Nagios. Useful for processing security alerts, as well as redundant and distributed Nagios setups.

Latest Version: 2.7.2 (07/03/2007)

NSCA 2.7.2 All versions (SourceForge)

NDOUtils

NDOUtils allows you to export current and historical data from one or more Nagios instances to a MySQL database. Several community addons use this as one of their data sources.

Latest Version: 1.4b7 (10/31/2007)

NDOUtils 1.4b7 (beta) All versions (SourceForge) Documentation

PNP

PNP allows you to graph Nagios performance data (monitoring metrics) using RRDTool.

Website: http://www.pnp4nagios.org/pnp/start

NagVis

NagVis is a visualization addon for Nagios that allows you to create custom views ("maps") of monitored systems and IT processes.

Website: http://www.nagvis.org/

Nagios Business Process Addons

The Nagios Business Process View and Nagios Business Impact Analysis addons allow you to visualize Nagios status information as it applies to your business processes and to simulate outages and see their effects on your business applications.

Website: http://nagiosbp.sourceforge.net/

NSClient++

NSClient++ is a Windows agent for Nagios that allows you to monitor CPU load, disk usage, process state, and more on Windows servers and workstations.

Website: http://trac.nakednuns.org/nscp/

Nagios Event Log

The Nagios Event Log agent allows you to monitor Windows event log messages with Nagios.

Website: http://www.steveshipway.org/software/f_nagios.html