r.surf.fractal(1grass) on Linux
The text b0c00c884bd4, as Debian 4.0 (Etch) shipped it.
GRASS module to create a fractal surface of a given fractal dimension. Uses spectral synthesis method. Can create intermediate layers showing the build up of different spectral coefficients (see Saupe, pp.106-107 for an example of this). Use this module to generate naturally looking synthetical elevation models (DEM).