Stimbox (since halted activity)
Xome (Relocated to Sacramento area)
Caroliner / Rubber O Cement (Not so "harsh", but classic stuff of course)
Survival Research Labs (Now in Petaluma, CA)
Allegory Chapel Ltd. (Originally Fairfield, CA)
Haters was stationed in SF for many years.
NON operated out of SF for many years as well.
Countless small acts no one mentions anymore, sometimes w/ good reason.
Include the neighboring city of Oakland and the list grows substantially. It's been well over 20 years since any noise type people could afford to live in SF... save for those enjoying rent control of course.