Quote by cscott
What are your opinions on Mathematica vs Maple vs ______?

AddUp 2?
Little shameless plug...
I wrote this calculation software to support a number of features including units and conversions, complex numbers, numeric bases, date and time calculations and many others that should be useful to science students. It is far from being at the same level as Mathematica or Maple, but you may find it useful for various tasks. It does not implement symbolic manipulations though, unlike these other, more advanced packages.