I've wanted a Raspberry Pi for a while, but I couldn't quite justify it. I also toyed with the idea of getting the $300 home edition of Mathematica (also limit

I've wanted a Raspberry Pi for a while, but I couldn't quite justify it. I also toyed with the idea of getting the $300 home edition of Mathematica (also limited to non-professional use, BTW), but again didn't have enough of a reason. Although my preference is for free software (hadn't heard of either SymPy or Mathics mentioned elsewhere), I like the idea of plugging a Raspberry Pi into the router, and being an X session away from Mathematica.