amira is a software application used in creating 3-D visualizations and geometric models of 3-D image data sets from various application areas. The product offering includes amira standard edition, amiraDev developer edition for extending the product by custom modules, amiraMol for molecular visualization, amiraDeconv for improving image quality in microscopy, and amiraVR for use in immersive VR environments. These products allows users to construct a visualization tailored to their needs. The software also allows 3-D objects to be represented as grids suitable for numerical simulations, notably as triangular surfaces and volumetric tetrahedral grids. It provides methods to generate such grids from voxel data representing an image volume, and it includes a general-purpose interactive 3-D viewer.