VisuCalc 1.0 (Windows)
Source: Intellitrend Business Solutions
From the developer: "VisuCalc 1.0 is a conversion and calculation tool designed for today's busy business managers who need access to critical information at a moment's notice. Now you can have the convenience of a pocket reference in the palm of your hand. Only, instead of looking up formulas to perform conversions and calculations, you can plug in data and have instant information. VisuCalc 1.0 has taken some of the most useful and commonly used calculation and conversion tables and converted them into a quick and easy user interface. The major components of this useful tool includes a Date Calculator, Time Zone Converter, Currency Converter, Unit Converter and Investment Calculator."