"Running MPI programs on a cluster of commodity hardware" was perhaps a sufficiently novel idea to warrant a unique name back in the 90s, but these days it's more or less the standard for all but the most exotic and expensive of scientific computing... and even those expensive custom supercomputers tend to still be x86 processors running MPI code.

Basically you don't hear about them any more because it's all Beowulf clusters now.

I think the "Beowulf" name (the name of the first well known computer cluster) was mostly a Slashdot meme. As Slashdot faded, so did the name "Beowulf".

Inferno is available for Nintendo DS, more info at https://gamebrew.org/wiki/Inferno_DS I can verify that it runs, at least, on a Nintendo DSi, though I never actually did anything with it and didn't have another DSi (or enough knowledge) to find out if it could actually network.

I'm guessing because recurring one-liners don't do as well here as they did on SlashDot.

Because now they're just clusters. Lots of people make hobby ones out of rpi's to tinker with

Those are Brambles: https://elinux.org/Bramble

This is why I originally got an odroid-c1 instead. IIRC newer rpi don't run Ethernet over the USB bus, so there's more bandwidth available.