Nagios: Core monitoring application
Centreon: web frontend for Nagios
NagVis : a great tools for configuring maps
Dokuwiki : online wiki
Official Nagios plugins : plugins to monitor servers
Contrib Nagios plugins : plugins offer by Nagios community
NDOUtils : Nagios module to store monitoring data in MySQL
NRPE : the check_nrpe plugin (NRPE daemon is not provided)
Authentification require for Nagios, Centreon, Nagvis. Use login "nagiosadmin" and password "nagiosadmin".