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Former Plex user and current Jellyfin user. Never tried Kodi however happy to see more options in this space.

Kodi evolved from XBMC, which is the OG of this genre.

In fact, if I'm not mistaken, the early Plex codebase was a fork of XBMC.

The original announcement mentions it as a split: https://www.plex.tv/ja/blog/announcing-plex/

Apparently there was an interim OSXBMC project as well.