Welcome to LQ.
NCTUns-allinone-linux-2.6.31.6-f12.20100113.tar.gz :
A full install : Fedora 12 only.
(And may be the Fedora 12 based CentOS6 / ScientificLinux SL6.1).
Other OS (Like Fedora 15) : An install with no "nctuns-kernel" :
http://wiki.ehas.org/index.php?title..._Debian/Ubuntu
Links : None. NCTUns has gone commercial, new name = EstiNet 7.0
http://www.estinet.com/products.php
..