SpeedCrunch Portable
keyboard-oriented scientific calculator
SpeedCrunch Portable is a keyboard-oriented scientific/algebraic calculator packaged as a portable app so you add up some quick sums or process advanced calculations wherever you go. You can place it on your USB flash drive, iPod, portable hard drive or a CD and use it on any computer, without leaving any personal information behind.
Features
Unlimited Variables
Syntax Highlighting
Functions, with 'Automagic' Completion
50 Decimal Precision
Input History
And more...
https://portableapps.com