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Plex is actually a (significantly diverged) fork of Kodi (then called XBMC). They might not share any code at this point.

I'm pretty sure Plex is a complete rewrite that only shares the name of Plex with that fork, and well the inspiration of it as well .

Actually had some people that worked on XBMC go and start Plex, bad blood included.

There was at least one complete rewrite since the OSXBMC devs days.