The Nagios metapackage
Nagios core - monitoring daemon, web GUI, and documentation
Official plugins for Nagios
50+ standard plugins for Icinga, Naemon, Nagios, Shinken, Sensu
FreeRADIUS Client framework
Nagios plugin to monitor the values of onboard sensors and disk temperatures
Strictly RFC 3986 compliant URI parsing library in C
Modules to streamline Nagios, Icinga, Shinken, etc. plugins
A SNMP Perl Module
Perl DES encryption module
Crypt::CBC compliant Rijndael encryption module
NIST SHA message digest algorithm