Supporting arguments

to support the use of Maxima vs other CAS eg. Maple, Mathematica ... and let the ones who argue Maxima, or its technology (eg. usage of lisp) is not a good idea in 2007

The most important argument for me is that maxima is free/open-source software. Therefore I can ask students to use it for coursework without asking them to use non-free software or worry about licenses. A related reason to use maxima, applicable if you are a US taxpayer, is that you've already contributed to its development through government funding.