insight3dng is an fork of insight3d. It lets you create 3D models from photos. From a series of photos, it automatically matches them and then calculates positions in space from which each photo has been taken along with a 3D pointcloud of the scene
Excellent PDF tutorial that explains how to take photos, how to use software, makes it easy to get started. It's open source rather than commercial software, insight3dng has many exporting options, has more options and capabilities.