OpCfg is a PHP-based HTTP configuration front-end to Nagios 3.x. OpCfg is a fork from Fruity.
OpCP is a capacity planning graph generator based on opdb ( nagios broker ) database.
The opdb project is a nagios broker that writes statistics and performance data to a mysql database.
OpMonAgent has been developed to get performance information from Windows Servers and return them to Nagios using the check_nt client.