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Rapid-Pi
Rapid-Pi is an add-on for Microsoft Word (and other word processors) that will transform the way you enter mathematical formulae, equations and expressions into documents. Rapid-Pi was designed with a single purpose in mind - to save you time when editing math in documents. Rapid-Pi allows you to enter mathematical expressions as easy-to-understand text. For example, to create a fraction you can just type "2/3".
MhcFS2 - engineering calculator (v.1.1). Calculates also integrals, the sums, derivatives; solve LSE, ODE, LSDE; finds roots, determinant;calculations with matrixes; interpolation with splain. Complete source codes are supplied
Resistor Color Bands is a resistance calculator for displaying resistance color codes and values for all types of resistors.
Falco Calculator is a useful program for education. It allows to calculate entered meanings of variables which are introduced as a formula.
UberSmart Math Facts is an easy to use flash card program that helps kids of all ages master their math facts. Students learn with flash cards, then test their skills with timed tests, and get a certificate when they have mastered a skill.