Simulink, proteus VSM, Virtual Breadboard, SigmaPlot, Yakindu Statechart Tools, Orange, Microsoft Mathematics, BMS, Swift Calcs, Collimator, KAlgebra, jasymca, OpenModelica, Insight Maker, FEATool Multiphysics, MuPhyN, 20-sim, Euler Math Toolbox, EMSO simulator, Circuit Solver Web, Dymola, AMESim, Drawlogix, Freemat, Emulino, Giac/Xcas, GAMS, Wolfram SystemModeler, Magma, SimulationX, Caedium, Mathmatiz, QtOctave, Enthought, Analytica, Minsky, VisSim, PyDSTool, Circuit Solver Desktop, ScicosLab, GiNaC, Sequalator, Math Solver II, Statwing, Math Notepad, DSHplus, WolfCalc, DataCracker, DAETools, Mathomatic, UltimaCalc, GAP, COSMOSWorks are some alternatives to Xcos.