RISC OS has been limping on thanks to the efforts of some extremely hard-working volunteers, but a roadblock is coming. The Pi 5 drops support for 32-bit ARM code, in which RISC OS written, and since enormous chunks of it are written in assembly, there is no trivial way to port.

Even so, it's heartwarming that people continue to put efforts into operating systems that aren't related to Unix or Windows. I'm happy to see people use this, and AmigaOS, and BeOS, and others. Computing shouldn't be a monoculture.