The best Graphing Calculator alternative to SpeedCrunch is Qalculate!, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SpeedCrunch and three of them are Graphing Calculators so hopefully you can find a suitable replacement. Other interesting Graphing Calculator alternatives to SpeedCrunch are MATE Calculator and Scientific Calc and Grapher.
Qalculate! is a multi-purpose cross-platform desktop calculator. It is simple to use but provides power and versatility normally reserved for complicated math packages, as well as useful tools for everyday needs (such as currency conversion and percent calculation).
MATE Calculator is the official calculator for the MATE desktop environment. It has been designed to be used with either the mouse or the keyboard. It is visually similar to a lot of hand-held calculators.
Easy to use scientific and graphing calculator with no ads! Advanced feature like finding zeros and intersections, as well as trigonometric functions!
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Qalculate is more user-friendly than SpeedCrunch, but more resource intensive.