I'm working on ffl (https://github.com/nuwainfo/ffl), an Actually Portable Executable (APE) that turns any file or folder into a secure P2P HTTPS link via WebRTC.
Like llamafile, it's built on Cosmopolitan Libc. Getting the full Python stack + WebRTC to run as a single APE binary was incredibly tricky to pull off, but the result is super convenient. I mainly built it to solve the pain of moving large files (logs, DB dumps) in and out of containers—now it's just one command.
The repo has a demo showing a round-trip transfer between Windows (x64) and Android (arm64) using the same binary. I hope you give it a try!