http://www.insanesoftware.de/index.php?page=freetools/terrain.php
http://www.insanesoftware.de
TEXGEN 700kb

The Terrain Texture Generator of insanesoftware.de is a little tool that can create a unique terrain texture for a height map. It does this by blending a set of base textures according to the slope or height in the height map. You can limit certain textures to certain heights or slopes, for example you can use a rocky texture for steep mountains and a grass texture for plateaus, creating more realistic terrain textures. Given a light direction, it can also create realistic per pixel lighting. Includes full source code (Borland C++ Builder).