Terragen
I made some stuff with Teragen. Pretty dang fun program, and it's free.
LINK: http://scratch.mit.edu/projects/blazerv82/296802
Pretty Hate Machine, Broken, Closer To God, The Downward Spiral, Further Down The Spiral, The Perfect Drug, The Fragile, And All That Could Have Been, With Teeth, Year Zero, Y34RZ3R0R3M1X3D, Ghosts I-IV, The Slip, Pretty Hate Machine 2010