Skybox Creator?

Are there any software’s which converts a single image into the 6 different images for a skybox? I have tried doing this myself but I can’t get it to work please can anyone help?

If your single image is a spherical projection: http://darendash.home.comcast.net/~darendash/CubeTheSphere.html

But you can also try setting the Texture Importer ‘Texture Type’ to ‘Advanced’ and click ‘Generate Cubemap’ and see how that works for you.