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This is literally running the Ubuntu x86 packages for python in the browser, by dynamically recompiling binary code to WebAssembly.

This demo is indeed just a Python REPL, but the technology is fully generic. On top of this you can make _any_ binary run. We are actually working on using this to preserve Flash content by running the official Adobe plugin safely in the sandbox.

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Kind of like Emscripten but for x86 instead of LLVM?

CheerpX is actually fully dynamic. You don't even need to "compile" things manually before. You can just feed binaries to the JS API and the program will run.

Appears to be proprietary based on the look of the website - what's the price range for this?

Our roadmap is to release our Flash solution in 2020, and we are in the process of finalizing the pricing of that. We have not yet defined how other uses (like REPLs) will work. If you have an interesting use case for our tech, drop us a line info@leaningtech.com

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