Does what is says on the Tin

MNTOS does what it says on the Tin

I did not find any issues on installing it
yes the documentation is a bit sparse but if you are a techy and can get around apache php etc
You should be fine.

By default MNTOS will not connect to Nagios sites using https as DOMDocument will check for CA certificate

The fix is to add the following to mntos.php
/* Allow https and disable CA Certificate check */
$context = stream_context_create(array(‘ssl’=>array(
‘verify_peer’ => false,
‘verify_peer_name’ => false,
)));
libxml_set_streams_context($context);

This can be added just after
$xml = new DOMDocument(‘1.0’, “ISO-8859-1”);
$nagiosxml = new nagiosxml;

BTW the author was very helpful after 7 years with helping on the contacts.ini info