ODEcalc for Windows: An Ordinary Differential Equation (ODE) Calculator! State your equation, boundary or initial value conditions, & it solves your problem. Plots solution y & derivative ydot versus x. Solves most Boundary Value Problems (BVP) & Initial Value Problems (IVP) for Nth order ODE. ODE may be nonlinear, implicit, and any order. Source code included ... it's short! Great teaching tool! An improved productivity example.