Personally I hate the Neverwinter Nights editor. It's certainly interesting, and the fact that it uses C++ for all of its scripting is certainly a plus, but it's just too darn fixed. If you want to make an adventure in the NW editor, it will be NW under another name. Even worse is that it is terribly difficult to make an empty room, even a simple thing as that, because NW editor automatically puts in junk in every single room that you make. Supposed to make it "easier", I suppose. Maybe I'm just biased because I hated the NW singleplayer campaign with a violent passion. Walking around in forty enormous dungeons (all of which look exactly alike, except for minor changes in lighting, contents, and layout), fighting hundreds of enemies that give you two experience points apiece, and levelups every two days or so... not really my idea of fun. =) Oh, and you might try Genesis3D. I'm not sure how low-level you are willing to go, but Genesis3D is a free, open source 3D game engine. Morrowind's editor is probably a better bet, though I don't know anything about that. But thanks for those links. Sauerbraten sounds really great to me, I'll have to check it out. =)