Tools:
Ordinary Differential Equations (ODE) tool
https://www.vosesoftware.com/riskwiki/OrdinaryDifferentialEquationstool.php
Matlab and the steps to solve:
https://www.mathworks.com/matlabcentral/answers/99565-what-tools-and-workflows-are-available-for-solving-differential-equations-in-matlab-8-0-r2012b
The World of Mathematical Equations
http://eqworld.ipmnet.ru/en/software.htm
http://eqworld.ipmnet.ru/en/software.htm
Maple, Mathematica, Matlab
Wolfram (alpha)
Numerically solve Differential Equations in Excel
