KaeilOS Openembedded Manager (KOM for short) is a tool designed to create and manage any OpenEmbedded based project, like KaeilOS, Angstrom, and others.
All KOM projects are a full-fledged overlay where you can also build your personal image or software packages. At the same time you can override other overlay in a simple way.
More details are available in the project website : kom.kaeilos.com