Angel

Angel is a simple yet useful tool to monitor the services on your network.
Technically speaking, it's a Perl program that runs every 'n' minutes
(usually fired from your cron) and calls different perl subprograms
(referred to as "plugins") to do the actual testing. It will then generate
an HTML table containing the status of your network. 

The Angel homepage is located at:

	http://www.paganini.net/angel/

Cryptographic signatures and checksums may be provided by 
the developers at the URL(s) above.  Wiretapped recommends
that users check these before use of the software/information.