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What computer program for automorphic forms

This question has its origins in this entertaining discussion on MO.

There are many programs (CAS) and libraries that are able to handle algebraic expressions. These are both a verification tool for (sometimes nightmarish) computations and a way to explore objects for which a good intuition is not available.

Among them, I have in mind Mathematica, Maple, Magma, and also the Python-interface Sage (including lots of packages like NumPy, SciPy, Maxima, GAP, etc.). Sage has the appeal to be free and open source, however I wonder if it is at the same level of the others.

To narrow the question to a more specific field, for every language has its advantages somewhere, I am interested in automorphic forms and number theory. Thus the basic uses will be to manipulate automorphic forms for different groups and congruence subgroups, to locate zeros of the associated $L$-functions, compute Fourier coefficients, etc.

What are the pros and cons of these programs to work with automorphic forms?

Every direction of answer is welcome, in particular taking into account

  • ease of use
  • available literature (not on the program itself, but related to automorphic forms)
  • regular updating of packages and functions
  • community size for support and discussion