GPU Caps Viewer is a free and highly-featured tool that quickly describes the essential capabilities of your graphics card/GPU including GPU type, amount of VRAM , OpenGL API support level, OpenGL API extensions database and general system configuration, as well as a GPU-Stress-Test functionality (GPU-Burner). Furthermore, this software will allow you to view extensive reports in text or XML format.
RedCrab is a scientific calculator with a full screen formula editor. The mathematical expressions are not typed in a typical command line, but can be enter in an editor window similar to a piece of paper. The calculator display the result either under or next to the expression. The handling is easier than conventional calculator.