The best open source alternative to PTC Mathcad is Maxima. If that doesn't suit you, our users have ranked more than 25 alternatives to PTC Mathcad and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to PTC Mathcad are wxMaxima, Calcpad, EngineeringPaper.xyz and Mathics.
Maxima is a system for the manipulation of symbolic and numerical expressions, including differentiation, integration, Taylor series, Laplace transforms, ordinary differential equations, systems of linear equations, polynomials, and sets, lists, vectors, matrices, and tensors.
wxMaxima is a document based interface for the computer algebra system Maxima. wxMaxima provides menus and dialogs for many common maxima commands, autocompletion, inline plots and simple animations.
Calcpad is a lightweight mathematical platform for cloud and desktop. It parses simple text scripts and converts them into professional Html reports. Supports complex numbers, variables, functions, graphing, units and numerical methods.
Very easy syntax to tap on, thus making it very convenient to do engineering calculation with units,function,plot and substitution. In a word, almost a perfect alternative for Calcpad.
Online engineering calculator that automatically checks/converts units, solves systems of equations, plots, and allows you to share your work with others.
Mathics is a general purpose computer algebra system (CAS) and designed to be a free, light-weight alternative to Mathematica. It's programmable using a Mathematica like language and uses a web interface for user interaction.
SymPy is a Python library for symbolic computation. The stated goals of the library are to become a full-featured computer algebra system and to keep a simple code base to promote extensibility and comprehensibility.
Xcos is a graphical editor to design hybrid dynamical systems models. Models can be designed, loaded, saved, compiled and simulated.
Open-source software for mathematical modeling, nonlinear equations, and optimization problems, supporting dynamic systems and large-scale models, with both command-line and graphical interfaces, specialized modeling language, and advanced solver architecture.
Axiom is a general purpose Computer Algebra system. It is useful for research and development of mathematical algorithms. It defines a strongly typed, mathematically correct type hierarchy. It has a programming language and a built-in compiler.
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It supports units of measurement, vectors and matrices, but is ligthweight, free and open source.