The Ninja project is an attempt to develop an alternative Nagios gui with the aim of being the most useful Open Source web front end for Nagios. You will be able to use them as a combination or replacement to the existing CGI's. Ninja is work in progress and we would love to get your input, ideas or most preferably patches ;)
Nowadays the preferred backend is Naemon in combination with naemon-livestatus.
These details are provided for information only. No information here is legal advice and should not be used as such.