PTC Mathcad, Mathematica, MATLAB, Maple, Derive, NumeRe, Ascend, SageMath, wxMaxima, OpenAxiom, WordMat, fxSolver, SymPy, Calcpad, Julia, MathStudio, FriCAS, VisSim, Cadabra, GiNaC, Function Analyzer, Yacas, MathJournal, Mathomatic, FormulaDesk Math, GAP, SymbolicC++ are some alternatives to Maxima.