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.



The best open source alternative to Horos is Weasis. If that doesn't suit you, our users have ranked more than 25 alternatives to Horos and nine of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Horos are Starviewer, 3D Slicer, Miele-LXIV and 3DimViewer.
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.



It is a medical imaging viewer capable of connecting to PACS servers, and/or open locally stored DICOM files in a DICOMDIR as well as stacks of regular image slices (PNG, TIFF, JPG...)




Slicer is a community platform created for the purpose of subject specific image analysis and visualization.




Free and open source one with a lot of useful extensions. Even though the interface looks a bit cluttered, there are tons of video tutorials that will help through it and once you grab the essentials, you'll be just fine.


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.








Aeskulap is a medical image viewer capable to load a series of special images stored in the DICOM format for review, query and fetch DICOM images from archive nodes (also called PACS) over the network.




Extensible, fully open source radiation therapy research platform and viewer for DICOM and DICOM RT.



Ginkgo CADx is a multiplatform (Windows, Linux, Mac OSX) DICOM viewer and dicomizer. Ginkgo CADx is based in free software (Open Core), so you are free to use and distribute the Open Source version with no cost.




Too complicated to set up and even more complicated to use.