General purpose Nagios/Icinga plugin for retrieving data.
Check_MK is a collection of extensions for the IT-Monitoring-Kernel
of Nagios/Icinga and together with this, and ideally also with
PNP4Nagios and NagVis constitutes a complete IT-Monitoring-System.
http://mathias-kettner.com/check_mk_download.html
http://mathias-kettner.com/checkmk.html