I first experienced using Bootstrap mixins like @include border-radius(5px); in a rails app that uses Sass/Scss and bootstrap-sass https://github.com/thomas-mcdonald/bootstrap-sass
This was a great experience, as I was able to use many bootstrap mixins without needing to migrate to/learn LESS, which bootstrap suggests if you would like to enable mixins in your app: http://twitter.github.com/bootstrap/extend.html
I now am working on a non-rails app, but would like to still use bootstrap mixins with SASS, rather than LESS. Does anyone know of a library or bootstrap sass mixins for non-rails apps?
If it is relevant, I'm using django in the new app.
UPDATED
Bootstrap now has an official Sass port, available here: https://github.com/twbs/bootstrap-sass
PREVIOUS
I found a version of bootstrap written in sass, much easier than installing ruby/compass/bootstrap-sass onto system running a non-rails app.
https://www.github.com/jlong/sass-twitter-bootstrap
I copied out the lib from sass-twitter-bootstrap and just attached the main sass file "bootstrap.scss".
done! no need to install anything extra on any system that can already handle sass.