A web "OS" and development environment with full linux emulation - MercuryWorkshop/anuraOS
I couldn't get any of the OS images to load on any of the browsers I tested, but they loaded for other people I tested it with. I think I'm just unlucky.
People have been reviving old hardware with Linux for decades now. Next step is to revive old organs too. If your kidneys aren’t good enough for their original purpose anymore, perhaps you can run Linux on them and give them a second life.
Yeah, that's what this uses. But copy's x86 emulator on their site does not have any sort of networking, while anura seems to use some kind of http proxy to have the vm be fully networked.
You can even install packages and run graphical apps in anura. (Very, very, very slowly).