A programming language for the construction of Doom maps. Integrated environment, shows you what the map described by the program looks like at the press of a key, and gives visual feedback about errors. Saves .wad files that only need to be BSP'ed. The programming language is a cross between a macro preprocessor and a lazy functional programming language.
NEWS: WadC is now maintained by Jon Dowland, here (1.2 and up). The last WadC released by me is 1.1: the readme to find out more about WadC, or download the zip (160k). You will need some form of Java JRE or SDK installed (here), and experience with programming languages & doom editing will help a lot.
Which looks like this when loaded up in Doom: