As always I read the daily arxiv sends to me and I have found a beatiful work due to Alkofer and collaborators. An important reason to mention it too here is that it gives an important tool to work with that can be downloaded. This tool permits to obtain Dyson-Schwinger equations for any field theory. Dyson-Schwinger equations are a tower of equations giving all the correlators of a quantum field theory so, if you know how to truncate this tower you will be able to get a solution to a quantum field theory in some limit.
I hope to have some time to study it and try a conversion for Maple. Currently I was not able to test it as on my laptop I have an older version of Mathematica but is just few hours away from testing on my desktop.