DICOMscope is described as 'free DICOM viewer which can display uncompressed, monochrome DICOM images from all modalities and which supports monitor calibration according to DICOM part 14 as well as presentation states'. There are more than 10 alternatives to DICOMscope 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 DICOMscope are MicroDicom (Free), Horos (Free, Open Source), Weasis (Free, Open Source) and Miele-LXIV (Free, Open Source).
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.
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.
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.
ClearCanvas Workstation is a full featured, easy to use PACS Workstation that comes in two editions: Clinical, which is FDA 510(k) cleared and intended for clinical use, and Community, which is free and open source.