Agentless Windows Monitoring using WMI and Remote Shell checks (WBEM Protocol)
Icinga check plugin for testing files against a checksum
Check Aruba APs plugin for Icinga
Icinga/Nagios plug-in to check cloudwatch metrics
Several plugins for icinga / nagios
Icinga Plugin to monitor metrics from Tinkerforge Bricks and Bricklets
Monitoring Plugin to check warranties on Dell servers and Gear
Icinga2 notification integration with Google Chat
Icinga Module for ASP.NET Core Health Checks