They appear to be available through both Rubygems and Bower.
All the bourbon/compass/etc stuff is great, but it's so full featured that it's too much at times. With this, I aimed to take the best stuff, the shit I actually use day to day, and make a super lightweight and easy to wrap your head around framework.
Plus, I don't do the whole ruby/rails thing. I really prefer node-sass/libsass. On big ass projects it's the difference between a 40 second compile and a 3 second compile.