OpenRadView

OpenRadView is a free, open-source viewer for DICOM medical images. The homepage says you open your own CT, MRI, and X-ray files on your computer, with no account. It states the tool is for learning and exploration, not for diagnosis. Processing stays local. Downloads are listed for Mac on Apple Silicon, Windows x64 as a preview, and Linux packages. There is no paid tier on the pages reviewed. The health category fits because the files are medical images, with the site's own limit that this is not a diagnostic device. It is a desktop program, not a web viewer and not a mobile app. Someone looking for a clinical reporting system or a patient portal will not find that workflow here.