Jim - An overview of Jim capabilities
Desmos - A beautiful, innovative, and modern online graphing 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.
WolframAlpha - WolframAlpha brings expert-level knowledge and capabilities to the broadest possible range of people—spanning all professions and education levels.
Weasis - Weasis is a multipurpose standalone and web-based DICOM viewer.
GeoGebra - GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching.