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SpeedCrunch

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SpeedCrunch is a fast, high precision and powerful desktop calculator. Available for Linux, Microsoft Windows, and Apple Mac OS.

Features:
- 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