RNS is available as a public domain program and can be downloaded by anonymous ftp from pauli.phys.uwm.edu in the directory /pub/rns. You can download either rns.version.tar.Z or rns.version.tar.gz. The code and documentation are also available at the website:
www.gravity.phys.uwm.edu/Code/rns
Please send any suggestions, comments or questions to the author at the following address:
Nikolaos Stergioulas
E-mail: niksterg@pauli.phys.uwm.edu