KiwiViewer is a free, open-source visualization app for exploring scientific and medical datasets. KiwiViewer opens a variety of file formats and provides flexible methods of accessing data, including Dropbox, Midas, iTunes file sharing, or download via url. Supported data types include meshes, images, and point clouds, with options for vertex coloring and texture mapping. File formats include: byu, g, jpg, kiwi, mha, obj, pcd, pdb, ply, png, stl, tiff, vti, vtk, vtm, vtp, vtu, and archive formats zip, gz, bz2, tar.