NAnt is available at http://nant.sourceforge.net and can be downloaded as a zip archive for free.

If you prefer, NAnt can also be checked out from its CVS repository with the following commands:

      
cvs -d :pserver:anonymous@cvs.sourceforge.net:/cvsroot/nant login
      
      
cvs -z3 -d :pserver:anonymous@cvs.sourceforge.net:/cvsroot/nant co nant
      
    

Then, to maintain your NAnt distribution, up-to-date, run the following command from the project's top directory:

      
cvs -z3 update -dP
      
    

To learn more about CVS, refer to the official user documentation.