nwc = network component. This plugin checks lots of aspects of routers, switches, wlan controllers, firewalls,.....

Thruk is a multibackend monitoring webinterface for Naemon, Nagios, Icinga and Shinken using the Livestatus API.

Plugin to monitor Rittal CMC3 devices

Livestatus Perl API to access runtime data from Nagios, Naemon, Icinga and Shinken.

Some of my monitoring plugins that can be used by Icinga, for example.

Create Nagios/Naemon/Icinga Config Files with Template Toolkit

A plugin (monitoring-plugin, not nagios-plugin, see also http://is.gd/PP1330) which scans logfiles for patterns.

A Nagios Plugin written in Perl for the Citrix ADC (formerly Citrix NetScaler). It uses the NetScaler NITRO API.

wintrap2mon processes events from MS Windows as snmptraps into Nagios, Naemon, Icinga...

Nagios/Icinga/Sensu plugin to check current server's RAID status ⛺

Icinga2 health check for ArubaOS-CX based devices

Icinga check plugin for network interface utilization

Set of Icinga/Nagios plugins to check hosts and hardware with the SNMP protocol.

SNMP walk-capable monitoring plugin for Icinga/Nagios

interfacetable_v3t (formerly check_interface_table_v3t)

Icinga2 health check for ArubaOS based devices

Icinga check plugin for AKCP sensorprobes with auto-discovery

Icinga check plugin for hwgroup poseidon devices

Icinga notification plugin for Poseidon sensor devices

Icinga check plugin for Starface Appliance/PBX