Experience complete astronomy with a real-time sky, comprehensive reports, arcsecond accuracy, and exciting events such as animation and live orbit-tracking. Sky Quiz and two encyclopedic reference sources are interactively linked to the sky display

CHEMIX School - Software for Chemistry It is equipped with a periodic table, molecular 3-D viewer, curve fit, spectroscopy, conversion table, dictionary and many advanced graphic tools and calculators. Chemistry lessons and problems are included.

RVal helps you select the best pairs of values to produce a given ratio, difference, or connect in series or parallel to produce an exact value. It will find the nearest preferred value or the one required in parallel with an existing value.