nDo, modular level design, PhilipK

Updated: 15 October 2010 - Bottom of post

So if you're at all interested in quick texturing and easily generating normal maps, cavity maps and friends from your photos or paintings, you've probably installed CrazyBump (available at the school, educational license) and xNormal (which, although it's mainly used for 3D geometry bakes, also comes with Photoshop plugins and is freeware).

nDo has been released. It's a set of Photoshop actions that allow you to generate normal maps from your images, as well as creating a sculpt layer for you to "sculpt" your normals in Photoshop. There's no realtime preview (a la CrazyBump), but other than that, it's really powerful, and means you can create your maps without leaving Photoshop.

Also, it's free.