Are there any specialized Computer Algebra Systems (or packages for these) for finding closed form solutions to 


a) partial differential equations,
b) stochastic differential equations?


If yes, what experiences do you have with these?



CAS for finding closed form solutions to PDEs and SDEs?
I have used Wolfram Mathematica extensively in my undergraduate course so far. Although the PDEs and systems of PDEs I have encountered have not been overly complicated, Mathematica is able to solve them in closed form most of the time. While not a "specialised" CAS for PDEs/SDEs, it gave me the closed form solutions I was looking for.


[This](http://reference.wolfram.com/mathematica/tutorial/DSolveIntroductionToPDEs.html) link may be useful in terms of gauging what you can do.


