Centreon (as of 1.4.x) is basicly a web application over nagios. The basic concepts of services / hosts and grouping are still there as well as contacts and contacts groups. This web interface brings nagios to a new era by letting you configure it with a couple of mouse clicks.
Perfdata sent by monitoring plugins, can optionally be used to generate rrdtool based graphs.
P
When some colleague or friends want to reuse your .pl regexp, it is great to have them copy and paste the pattern in their PCRE language binding. Thanks for making this possible.