Diffpack Online
An object oriented development framework for the solution of partial differential equations. Free demo CD. Online ordering.
Dr. Hanley's Science Graphs
Enter first and second order non-linear ordinary differential in analytical form. The program will generate a numerical solution to the equations and graph multiple curves on a single graph. Can also be used for algebra and calculus formulas. Includes illustrations and free demo.
FlexPDE
A general, script driven solution system for Partial differential equations, including equation interpretation, mesh generation, numerical solution and graphical output.
XMDS: eXtensible Multi-Dimensional Simulator
A code generator that integrates equations translating from XML to C++. Unix/Windows. Free to download under GPL.