Zero Brush - blendersensei.com/zero-brush Texture painting, sculpting, and baking addon for Blender.
Pix4Dmapper - Photogrammetry software for professional drone-based mapping, purely from images.
TrueSculpt - Model a virtual clay ball by pushing or pulling it with your fingers.
Regard3D - Regard3D is a free, multiplatform, open-source structure-from-motion application.
3D-Coat - 3D-Coat is the one application that has all the tools you need to take your 3D idea from a block of digital clay all the way to a production ready, fully textured organic or hard surface model.
RealityCapture - RealityCapture is a software solution which automatically produces high resolution 3D models from photographs or laser-scans.