Paal Olstad has released 'Ghosts: A Doll's House'. The 16 levels are well designed and decorated and many were made by others. All graphics, sounds and music have been changed and while it retains the Wolf3D feel somewhat, the mod also has an atmosphere of its own. New music was contributed by Tricob. Code changes include a missile launcher, Plasma gun and breakable objects. As with 'A Doll's House', Paal's last mod, the game requires a lot of thought to play. There's more info and the download here.