Calc! for

From Daniel Dube:

Powerful and convenient calculator with nice design. It works with expressions in four different screen modes: standart, unit conversion, programmer and statistics. It allow to apply user variables, has error recognition system, which shows a cause and a place of error, and has a special editing system with history & undo. Main features: 15-digit precision. Normal and scientific output. Support for all standart mathematical functions including inverse and hyperbolic trigonometry. Unlimited number of variables. Unit conversion (100 units supported). Statistics (with view & editing). Base conversion (from 2 to 36). More than 130 built-in constants. History. Multi-step undo. Error recognition. Full support of clipboard functionality. Customizable fonts.