Athena DICOM Viewer is described as 'breakthrough medical imaging software, an evolution of DICOM Viewers'. There are more than 10 alternatives to Athena DICOM Viewer for a variety of platforms, including Windows, Mac, Linux, Online / Web-based and iPhone. The best alternative is InVesalius 3, which is both free and Open Source. Other great apps like Athena DICOM Viewer are Horos (Free, Open Source), Weasis (Free, Open Source), MicroDicom (Free) and 3D Slicer (Free, Open Source).
Weasis is a multipurpose standalone and web-based DICOM viewer with a highly modular architecture. It is a very popular clinical viewer used in healthcare by hospitals, health networks, multicenter research trials, and patients.
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.
Miele-LXIV is a DICOM workstation, viewer and more. The project started in November 2014 as a fork of the popular open source 32-bit project OsiriX, but it has been modified to become a 64-bit application and to remove many of the limitations of the 32-bit version.
Materialise Mimics is software specially developed by Materialise for medical image processing. Use Mimics for the segmentation of 3D medical images (coming from CT, MRI, micro-CT, CBCT, 3D Ultrasound, Confocal Microscopy).