J. Andrzej Wrotniak

The Advanced Sci/Eng Calculator offers 18 digit precision expression evaluation, over 100 functions, variable input, graphing capabilities, unit conversion, interpolation, polynomial regression, linear algebra, and optimization. It can solve systems of linear, nonlinear, and differential equations.

This puzzle game appeals to ages teen to adult and is reminiscent of Boulderdash. There is no gore or violence. The free trial version offers 10 games with 49 levels. Registering offers over 500 games with 2500 levels and a game editor. There are sound effects and a worldwide Hall of Champions.

Small yet intelligent calculator that enables users to enter any mathematical expression.