Yup I noticed this some time back, it would need converted from Objective C back to C++. Quite a big job, my biggest worry is that its, for all intents and purposes, dead, development wise. This would need to be taken on as an engine to be developed not just converted. Also, the license is a little vague, as it was obviously meant to be sold by the original Xors3D guys and its not PD/MIT etc. IF you could get a hold of Nightmare, the original dev., then maybe this could be sorted out?