Some months ago, I already reported about a remake of Nitemare 3D for GZDoom, that is under development by MetroidJunkie. Well, it is not dead yet, in case it's still under heavy progress according to the mapper himself. Many aspects of the original game have been converted and MetroidJunkie is currently focussing on other new and nifty ideas to spice the old game up a bit. Several new screenshots and some reports can be found in the development thread over at ZDoom.org. Drop him a line, give him some feedback, as this is one of the projects I am looking forward a lot.