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NetSaint has been replaced by Nagios....

from the debian repository:

Description: A host/service/network monitoring and management system

  Nagios is a replacement of the Netsaint project. It accept and uses the

  previous Netsaint modules transparently.

  .

  Nagios is a host/service/network monitoring and management system. It has

  the following features:

  .

  o Monitoring of network services (via TCP port, SMTP, POP3, HTTP, NNTP,

        PING, etc.)

  o Plugin interface to allow for user-developed service checks

  o Contact notifications when problems occur and get resolved (via email,

        pager, or user-defined method)

  o Ability to define event handlers to be run during service or host events

        (for proactive problem resolution)

  o Web output (current status, notifications, problem history, log file, etc.)

  .

  Nagios was written in C and is designed to be easy to understand and modify

  to fit your own needs.

  .

  This package contains the common files for all the other nagios packages.

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