This is a plugin package for Netsaint.  Quoting from the
main Netsaint package:

NetSaint is a program that will monitor hosts and services
on your network. It has the ability to email or page you
when a problem arises and when it gets resolved. NetSaint
is written in C and is designed to run under Linux, although
it should work under most other *NIX variants. It can run
either as a normal process or as a daemon, intermittently
running checks on various services that you specify. The
actual service checks are performed by external "plugins"
which return service information to NetSaint. Several CGI
programs are included with NetSaint in order to allow you
to view the current service status, history, etc. via a web browser. 

WWW: http://www.netsaint.org/