The MS Excel guru Hans Cronander presents models for R.L. McCoy / Gavre exterior ballistics and Black & Scholes / Monte Carlo option value determination. The source code includes an ODE engine. The author offers VBA source code access, as long as they share the improved code with him.

ODEcalc for Windows: An Ordinary Differential Equation (ODE) Calculator! State your equation and boundary or initial value conditions and it solves your problem. Plots solution y and derivative ydot versus x. Solves most Boundary Value Problems (BVP) and Initial Value Problems (IVP) for Nth order ODE. ODE may be non-linear, implicit, and any order. Source code included ... it`s short! Great teaching tool! A Fortran Calculus demo appl.