Kelly is a desktop calculator
download temp. offline
Runs on Win 95/98/NT/Me/2000/XP/2003/Vista/7
Very easy interface
Use numpad to use
Hotkey to toggle between an amount with and without tax
Hotkey to toggle between 2 currencies
How simple can a calculator be? I tried to build the simplest one without any garbage. Don't get distracted by it's size. I am doing all my tax on it :) It stays on top and works well with Excel.