Nagios - www.nagios.org
Seagull - http://seagull.phpkitchen.com
OpCfg - http://www.opmon.org/project/opcfg
OCSInventory - http://www.ocsinventory-ng.org
phpLogCon - http://www.phplogcon.org
PHP - www.php.net
CentOS - http://www.centos.org
Memcached - http://www.danga.com/memcached/
OTRS - http://www.otrs.org
Nedi - http://nedi.sourceforge.net
Apache - www.apache.org
MySQL - http://www.mysql.com
NagTrap - http://www.nagtrap.org
NTOP - http://www.ntop.org
Foundation - http://foundation.zurb.com/