4D Moment
4D Moment is a free 3D capture app in development: you film an object or a moment with one phone, and the 3D reconstruction is planned to be computed on the phone itself, so that no server of ours receives your camera images. Later versions aim to extend this to several phones filming one action together and computing a moving 3D scene, end-to-end encrypted and connected through PolySwiss. The planned first test version is specified to show a title screen only and is not yet built; it has not been released, and there is no download yet.