NSCA project is part of the main Nagios project and can be downloaded from the same Nagios download page as the rest of Nagios.

In order to build NSCA from sources, we will need to download the source code. This can be downloaded from the Nagios project page and can be found in the add-ons section (visit http://www.nagios.org/download/addons/ for more details). The file is named in the form of nsca-2.7.2.tar.gz, where 2.7.2 is the version of NSCA. It is always recommended that you download the latest stable version.

Many Linux distributions already contain prebuilt NSCA binaries. If you are not an experienced user and just want to test NSCA out, you might want to try the prebuilt binaries.

For Ubuntu Linux, the package name is nsca. So all that needs to be done is to run the command is:

apt-get install nsca

For systems that offer yum for downloading packages, the command is as follows:

yum install nsca

NSCA binaries for various operating systems can also be found on NagiosExchange...