fxSolver is described as 'Online math solver, equation library, graphing calculator and science/engineering problem helper' and is a popular Calculator in the Education & Reference category. There are more than 100 alternatives to fxSolver, not only websites but also apps for a variety of platforms, including Windows, Android, Mac and Linux. The best alternative is SpeedCrunch, which is both free and Open Source. Other great sites and apps similar to fxSolver are Microsoft Office Excel (Paid), Wolfram Alpha (Freemium), GNU Octave (Free, Open Source) and Qalculate! (Free, Open Source).
SpeedCrunch is a free, fast, high precision open source algebraic calculator with an intuitive interface and a extensive list of features, including: Unlimited Variables, Syntax Highlighting, Functions, with 'Automagic' Completion, 50 Decimal...
Wolfram Alpha is a "Computational Knowledge Engine" - different from a search engine, it answers factual queries directly by computing the answer from structured data, rather than providing a list of documents or web pages that might contain the answer.
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Almost everyone thinks Wolfram Alpha is a great alternative to fxSolver.
Octave is a computer program for performing numerical computations which is mostly compatible with MATLAB. It is part of the GNU Project. It is free software under the terms of the GNU General Public License.
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).
GeoGebra is free and multi-platform dynamic mathematics software for learning and teaching. It has received several educational software awards in Europe and the USA. Apps: GeoGebra Graphing Calculator ...
MATLAB is a numerical computing environment and programming language. Maintained by The MathWorks, MATLAB allows easy matrix manipulation, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs in other languages.
Math is the LibreOffice suite's formula editor, that can be invoked in your text documents, spreadsheets, presentations and drawings, to enable you to insert perfectly-formatted mathematical and scientific formulas.