|Warning: Kodi does not recommend the use of OpenElec as it is no longer actively maintaned. We recommend LibreELEC 
OpenELEC (short for "Open Embedded Linux Entertainment Center") is a free and open source, small and very fast booting, embedded operating system. OpenELEC is a complete media center software suite that comes with a pre-configured version of Kodi and third-party add-ons with retro video game console emulators and PVR plugins.
OpenELEC is also designed to be used with flash based drives, like compact flash, USB drives, or SSDs.
OpenELEC works on most computers you can install Kodi on, even the Raspberry Pi and the Archive:Apple TV 1 (silver only).
OpenELEC includes all features that Kodi has to offer.
A detailed guide about installing OpenELEC can be found at their wiki page: Installation
A detailed guide about updating OpenELEC can be found at their wiki page: Updating