Linux links > Distro specific > Source distros

Gentoo
Very popular source distribution. Gentoo Linux has an advanced package management system called Portage. It's a true ports system in the tradition of BSD ports.

Linux From Scratch
LFS is a Linux distro that is not a distro. As the name suggests, you build your own Linux system from scratch. Actually this link should be under "Documentation" because building Linux from scratch teaches you all about the way things work in Linux.