SpeQ Mathematics - SpeQ is a small, extensive mathematics program with a simple, intuitive interface.
Jim - An overview of Jim capabilities
Qalculate! - Qalculate! is a multiplatform multi-purpose desktop calculator.
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.
NumWorks - The graphing calculator that makes learning math easier.
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.