OpalCalc

OpalCalc is a new type of calculator for the PC. As easy to use as Notepad or a word processor, OpalCalc allows natural language in the sum and multi-line support so you can go back and adjust your previous calculations on the fly.

For years, PC calculators have been trying to copy handheld calculators in both functionality and appearance. OpalCalc sets out to disregard previous conceptions, and instead we considered how a calculator should behave with a full keyboard in mind. The result is simplicity itself, but with almost spreadsheet-like capability. OpalCalc is ideal for everyone from students to teachers, programmers to scientists, or even for calculating your grocery shopping or holiday bill.

Built in features include percentages, currency conversion, custom functions/variables, excellent documentation, colour coding, lightweight size, configurable GUI, hundreds of measures and functions, and lots more. The full version can be obtained with a donation of any amount (even a few pence). There is no time limit in the 'lite' version, just a 5 line limit which is very useful for most purposes.

Key Features:

Lightweight footprint (less than 600k)
Multiline support (notepad style)
Configurable GUI with colour schemes
Built-in 'Quickstart' tutorial
Full colour coding,
Multiple undo/redo, zoom in/out, etc
Numerous built-in functions
Percentages & hundreds of measures
Currency support with conversion
Portable (260k from a pen drive!)
Custom variables and functions
Programmer syntax and functions
Custom number base support
Advanced notation support.