Several specialized software tools are used for rendering nanostructures: 1. Blender: An open-source 3D modeling and rendering software that can be adapted for nanoscale rendering. 2. VMD (Visual Molecular Dynamics): Specifically designed for modeling and visualizing molecular structures. 3. PyMOL: A molecular visualization system that is highly regarded in the field of computational biology. 4. COMSOL Multiphysics: Useful for FEA and multiphysics simulations, often used in nanotechnology research.