Not since Steve Jobs' Next computers did Wolfram Research offer Mathematica, its premium mathematics, processing, and analysis software, for free.
The Next was an expensive, higher-end workstation. This time around, Wolfram is giving away Mathematica for computers at the opposite end of the spectrum: the diminutive, $25 Raspberry Pi.
It's a nice horse to hitch your cart to. Two million Raspberry Pi machines have been sold so far, and they're popular in the educational circles that Wolfram also targets.