http://3dstereophoto.blogspot.com/

Automatic depth map generation, stereo matching, multi-view stereo, Structure from Motion (SfM), photogrammetry, 2d to 3d conversion, etc. Check the “3D Software” tab for my free 3d software. Turn photos into paintings like impasto oil paintings, cel shaded cartoons, or watercolors. Check the “Painting Software” tab for my image-based painting software. 

Stereophotomaker uses this for creating depthmaps. All the programs are free.