Given that it’s conventional to give objects to other people around this time of year, we thought we’d collect together some suggestions for things we think you, a mathematically interested person, might like to buy for your mathematical friends (or add to your list before you send it off to Santa).
Wolfram have released a version of Mathematica and the new Wolfram Language to run on the low-cost Raspberry Pi computer, and both are free.
I have Mathematica up and running on my Raspberry Pi, having followed the instructions on the Raspberry Pi site; future Raspbian images will ship with the Wolfram Language and Mathematica by default.