I don't know about more obscure but I've frequently used Foundation and like it. It doesn't feel as bloated at Bootstrap. I haven't used Bootstrap in awhile, so

I don't know about more obscure but I've frequently used Foundation and like it. It doesn't feel as bloated at Bootstrap. I haven't used Bootstrap in awhile, so maybe it's gotten better, but I always felt like the number of elements required even for a simple modal seemed like overkill.