science software (2 products)

Atoms, Symbols and Equations 4.0 (Shareware, $24)

Unique interactive multimedia Chemistry teaching software that tests students as they learn. Topics covered include: elements, atoms and molecules, word equations, chemical symbols, Periodic Table and chemical formulas. Plus interactive simulations to teach the balancing of chemical equations and the formulas of ionic compounds. As far as possible, skills are taught through familiar examples, to help reinforce general chemical knowledge. Written by a teacher for use in schools, but an excellent personal tutor for anyone beginning to study Chemistry. Questions constantly test understanding and hints are given when answers are wrong.

DPlot 1.971 (Shareware, $32.00)

DPlot is a general purpose plotting program designed for scientists, engineers, and students. It features multiple scaling types, including linear, logarithmic, and probability scales, as well as several special purpose graphs: tripartite grids (shock spectra), grain size distribution plots, polar plots, contour plots of 3D data, and box-and-whisker plots and dot graphs of one or more 1D samples. Manipulation functions include FFT, filtering, and smoothing. Data can be input via a variety of file formats, copied from the clipboard, sent to DPlot from another program via dynamic data exchange, or generated by formula. Source code for example Visual Basic and C demo driver programs are included.