Packages with the squashfs use flag

app-portage / layman : Tool to manage Gentoo overlays

  • Support mounting squashfs image overlays locally read-only

dev-util / diffoscope : Will try to get to the bottom of what makes files or directories different

  • Use sys-fs/squashfs-tools

sys-cluster / charliecloud : Lightweight user-defined software stacks for high-performance computing

  • Use sys-fs/squashfs-tools for creating SquashFS images