Zurb Foundation seems to be what you are looking for. It uses SASS and actually predates bootstrap and is being actively maintained. Its a great alternative. http://foundation.zurb.com
Bootstrap came out of Zurb, Mark worked with them and learned everything, and then when he went to Twitter he re-used a bunch of zurb to create the first version of bootstrap.
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Zurb Foundation seems to be what you are looking for. It uses SASS and actually predates bootstrap and is being actively maintained. Its a great alternative. http://foundation.zurb.com
It does use Sass, but was released after Bootstrap.
Bootstrap came out of Zurb, Mark worked with them and learned everything, and then when he went to Twitter he re-used a bunch of zurb to create the first version of bootstrap.
Discussion here: http://news.ycombinator.com/item?id=4588053
Do you realize you are replying to the Mark you're referencing in your comment?