Text for the site has been written on Amigas, Wintel PCs, BeOS boxen, LINUX machines, Macintoshes and iOS devices over the years, but always using a straight text editor. Graphics have been manipulated on about as many platforms.
General design is simplistic to accommodate handheld based web-browsers. This is one of the reasons there's a general lack of CSS, JavaScript, Java, Flash or anything else that requires a platform-specific impementation. It's also easier to maintain from a variety of different computers in a number of locations.