SpeedCrunch is a desktop calculator for power users. Available for Linux, Microsoft Windows, and Mac OS X.

Overview:

• history and results on a scrollable display
• up to 50 decimal precisions
• unlimited variable storage
• intelligent automatic completion
• fully usable from the keyboard
• more than 50 built-in math functions
• optional virtual keypad to be used with a mouse
• on-the-fly and selection calculation
• customizable appearance
• syntax highlighting and parentheses matching