I’ve spent a lot of time lately looking for and at XML authoring tools. Usually, it’s a pretty dry exercise, but I just came across one that made me laugh.
Xopus is an XML authoring tool that operates in the browser (IE 6 or 7 and Firefox 2 or 3). To illustrate the tool’s capabilities (and their sense of humor) the developers have a demo on their website in which you can author an XML document in such a way that it feels like you are playing tic-tac-toe against a computer. It’s awesome.