A passive agent for Nagios. HTTP/S submission of checks, and a cross platform nature make it easy to install behind firewalls in hetrogeneous envrionments,
There are some issues with the nagios checks in NPA, where an external script is called. The documentation seems to be out of date as well, and this needs correcting.
There seem to be some compatibility issues with the latest Solaris updates on JVM 1.6. The agent needs testing with newer versions, and possibly compiling with a later 1.5.0 version in order that the byte-code be compatible.