NSClient++ - Windows client agent voor Nagios.
Consol - Goodies for Nagios
NagVis is a visualization addon for the well known network managment system Nagios.
GitHub - Opin Kerfi
GitHub - opinkerfi/nagiosplugins Small army of nagios-plugins either made or maintained by opinkerfi
cloudguruz - HP EVA SAN monitoring in Nagios/Nagios XI using “check_eva.py”
Nagstamon is a Nagios status monitor for the desktop. It connects to multiple Nagios, Icinga, Opsview, Centreon, Op5 Monitor/Ninja, Check_MK Multisite and Thruk monitoring servers and resides in systray or as a floating statusbar at the desktop showing a brief summary of critical, warning, unknown, unreachable and down hosts and services and pops up a detailed status overview when moving the mouse pointer over it. Connecting to displayed hosts and services is easily established by context menu via SSH, RDP and VNC or any self defined actions. Users can be notified by sound. Hosts and services can be filtered by category and regular expressions.
Nagios Wiki - Checking Blacklisted MTAs with CentOS + check bl
Nagios Wiki - Check outlook web access
Nagios Wiki - Nagios Checks for Exchange Server 200x
Nagios Wiki - Checking NT Services with Nagios
Hack My Idea - Misc Windows checks for Nagios