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I'd personally have to nominate Fabrice Bellard. Here's a short list of things he made:

  • QEMU - Originally a PC emulator via dynamic recompilation, it went on to become a fully fledged virtualizer.
  • FFMPEG - Universal video player/converter
  • A PC emulator written in Javascript.
  • A C99 compiler from scratch.


And those are just the main ones. He's a prolific serial achiever since the 1980s.

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