[ElectricalUnion]

jart Cosmopolitan. It combines a polyglot format (the αcτµαlly pδrταblε εxεcµταblε is simultaneously a Windows Portable Executable and a Thompson Shell script) and a polymorphic libc that works in all major OSes under both amd64 and arm64.

It's a single binary.

[trollbridge]

And produces binaries that are smaller than a typical single-OS build.