Development of nMod has ceased, as it has been superseded by my latest project, a C++ concurrent n-body model development framework called Moody. Moody is also cross platform, is released under an open source licence and has Celestial and Orbital Mechanics capabilities which exceed those available in nMod.
Moodys homepage can be found here.
I'm leaving nMod online mainly for sentimental reasons, I put a lot of effort into it, and its always possible someone might still find it useful.
The Solar System model included with nMod is being further developed within that project, not this one, and can be found here
Dr Carey Pridgeon 2008