[barrkel]

I think choosing distros from slightly more diverse backgrounds makes sense. Ubuntu includes most Debianisms including dpkg / apt-get, CentOS includes most RedHatisms including rpm / yum, while openSUSE is a third way (that I know little about).

Replacing openSUSE with Debian wouldn't be sufficiently differentiated from Ubuntu, IMO.

The inclusion of something inheriting from Linux From Scratch might be warranted for didactic purposes - just for understanding what bits a Unix is made out of, fundamentally.

[galago]

When I first clicked the link, I was hoping it would be something like Linux From Scratch. That however, would be a completely different class. More like math-for-future-mathematicians vs. math-for-future-engineers. I wonder if LFS could be adapted for EdX?