WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
Jim - An overview of Jim capabilities
3D Slicer - Slicer is a community platform created for the purpose of subject specific image analysis and...
Insect - High precision scientific calculator with full support for physical units.
MicroDicom - DICOM viewer. MicroDicom is a free DICOM viewer. Export to the most common picture formats, movie, clipboard. It is equipped with most common tools for manipulation of DICOM images.
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.