The best Mac alternative is IDA-STEP Viewer, which is free. If that doesn't suit you, our users have ranked more than 10 alternatives to STP Viewer and three of them are available for Mac so hopefully you can find a suitable replacement. Other interesting Mac alternatives to STP Viewer are Mayo (Free, Open Source) and CaniVIZ (Freemium). Autodesk Viewer is a free online viewer for 2D and 3D designs including AutoCAD DWG, DXF, Revit RVT and Inventor IPT, as well as STEP, SolidWorks, CATIA and others.
OsiriX Viewer — (Mac) The most widely used DICOM viewer in the world, with ultrafast performance, an intuitive interactive user interface, exclusive innovative techniques for 3D/4D/5D navigation and an open platform for development of processing tools.
AccuLite — (Windows) Free DICOM viewer and basic browser for DICOM datasets. This can be used to create auto-run CDs of DICOM studies that will run on most modern PCs.
MicroDicom — MicroDicom is application for primary processing and
preservation of medical images in DICOM format. It is equipped with most common tools for manipulation of DICOM images and
it has an intuitive user interface. It also has the advantage of being free for use and accessible to everyone.
AMIDE — (DOS, Mac, Windows and Unix) Free tool for viewing,
analyzing, and registering volumetric medical imaging data sets. It’s been developed using GTK+/GNOME, and runs on any system
that supports the toolkit.
Dicom2 — (Windows and Unix) a free command-line driven program which
allows you to convert medical images and DICOM files to various other formats, while optionally performing
some rudimentary image processing tasks.
Dicom3Tools — Tools and libraries for handling offline
files of DICOM 3 attributes, and conversion of proprietary formats to DICOM 3. Can handle older ACR/NEMA format data, and some
proprietary versions of that such as SPI.
eViewbox — (Web Based, Mac and Windows) Eviewbox, is an
open source radiology project. This application allows to view many kind of images, including DICOM. When
images are all the same size it allows for multiplanar reconstruction. The corresponding EViewBox applet allows for a multiplatform
distribution of medical images. The application footprint is under 120 K and can be sent with the images.
ezDICOM — (Windows) This software
is designed to display most medical images: MRI, CT, X-ray, and ultrasound. All versions of ezDICOM can automatically detect
and open Analyze, DICOM, Genesis, Interfile, Magnetom, Somatom and NEMA images.
iRad — (Mac) Dicom viewer specifically developed for the Mac os.
IDICON — (DOS and Unix) A software package which includes tools
for automatic conversion between the medical image formats Interfile 3.3 and DICOM 3.0, and for manipulating files in DICOM 3.0
format.
Irfanview — (Windows) Fast and compact tool that can batch convert DICOM
images to JPEG, GIF, PNG, TIF or other common computer graphic formats.
MyPACS: Teaching File Authoring System — Free web application allows
radiologists to create their own online teaching file repositories by uploading medical images through their web browser.
Offis — (Mac, Windows and Unix) Multiple software tools
for viewing and manipulating DICOM and other medical image formats.
XNView — (Windows and Unix) This site features numerous
free radiology image viewing and manipulation tools.