you could use the
listings package if what you have is just code. It does not have the definition for Maple, however, lucky for you, Alexander Shapiro already ran into that problem. The following is taken from Here, and should go in your preamble.
%% Maple definitions (c) 2008 Alexander Shapiro
If you want to include whole worksheets with inputs and outputs, then look into
maple2e. The file maple2e.sty is supplied by Maplesoft, and you should move it to the proper folder on your machine look here for instructions.
maple2e can be found Here and here.