NSCA Client
NSCA is a Linux/Unix daemon allows you to integrate passive alerts and checks from remote machines and applications with Nagios. Useful for processing security alerts, as well as redundant and distributed Nagios setups.
This client allows you to send easily passive alerts and checks.
Usage:
require "nsca/client"
NSCA::Client.servers << NSCA::Client::RemoteServer.new(:host => '172.0.0.1')
service = NSCA::Client::Service.new(:name => 'TestMessage')
NSCA::Client.critical service