SpeedCrunch — Free High-Precision Scientific Calculator

Source: https://www.speedcrunch.org/

A free, open-source high-precision scientific calculator.

Built for STEM professionals, students and teachers.

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Free to download and use on Windows, macOS, and Linux.

- Up to 50 digits of precision, with complex number support

- 140+ functions, and a myriad of units and constants

- User-defined variables, functions, and units

- Vector and matrix support

- History rewriting, and per-result settings

- Keypad presets and a fully customizable layout

- Multiple active sessions with tabs, panes, or windows

- More than 40 translations, and over 40 color schemes