Pentoo is a security-focused livecd based on Gentoo It’s basically a gentoo install with lots of customized tools, customized kernel, and much more. Here is a non-exhaustive list of the features currently included: Hardened Kernel with aufs patches, Backported Wifi stack from latest stable kernel release, Module loading support ala slax, Changes saving on usb stick, XFCE4 wm and Cuda/OPENCL cracking support with development tools.
Pentoo is Gentoo with the pentoo overlay. This overlay is available in layman so all you have to do is layman -L and layman -a pentoo. We have a pentoo/pentoo meta ebuild and multiple pentoo profiles, which will install all the pentoo tools based on USE flags.