Well, wasn't Fabrice Bellard the guy who built a virtual machine with JS so that you could run Linux within the browser?
https://bellard.org/jslinux/vm.html?cpu=riscv64&url=fedora33...
And thanks to that we can run Linux in a PDF as well..
And FFMPEG, the standard codec suite for Unix today. And Qemu, the core of KVM. Plus TCC, a great small compiler compared to C/Clang altough cparser has better C99 coverage. Oh, and some DVB transmitter reusing the MHZ radiation from a computer screen by tweaking the Vidtune values from X. It's similar to what Tempest for Eliza does.
Fabrice is an absolute legend. Most people would be content with just making QEMU, but this guy makes TinyC and FFmpeg and QuickJS and MicroQuickJS and a bunch of other huge projects.
I am envious that I will never anywhere near his level of productivity.