Textured version of A.N.T.Landscape & BlendPeaks
http://blender-3d.338.s1.nabble.com/Textured-version-of-A-N-T-Landscape-td230.html
Landscape add-on
http://blender-3d.338.s1.nabble.com/Make-Waves-with-the-landscape-add-on-and-simple-deform-modifier-td161.html