Pentoo

Pentoo layers a dedicated security-tools overlay on top of Gentoo, inheriting Gentoo's Portage package manager and source-based compilation model -- meaning packages (and their compile-time options, like specific wireless-driver patches) can be tuned far more precisely than on a binary-package distribution like Kali or Parrot. It's distributed primarily as a live environment (bootable from USB/DVD) with full-disk-encrypted install support, and includes patched Wi-Fi drivers useful for wireless security auditing that aren't always available unmodified upstream. It appeals specifically to Gentoo users who want that distribution's build philosophy applied to security work, rather than switching to a Debian- or Arch-based security distro.