I checked Gimp and Fractal Terrain, even though I don't use either one as much as most. I still prefer the Morgensen fractal generator; it's plenty flexible if you can get used to the lack of an interface (command line only).
Raster (bought) [e.g. Photoshop, PaintShopPro, Painter]
Raster (free) [e.g. GIMP]
Vector (bought) [e.g. Illustrator, Corel Draw, Xara]
Vector (free) [e.g. Inkscape]
Vector (Symbol driven) [e.g. CC, Dunjinni]
Online Generator [e.g. City Map Generator, Fractal World Generator]
Fractal Generator [e.g. Fractal Terrains]
3d modelling [e.g. Bryce, Vue Infinite, Blender]
Scanned hand drawn maps
Drawing Tablet and pen [e.g. Wacom]
I checked Gimp and Fractal Terrain, even though I don't use either one as much as most. I still prefer the Morgensen fractal generator; it's plenty flexible if you can get used to the lack of an interface (command line only).