Best place to start would be Lustmord. Then maybe check the old Cold Meat Industries catalogue. I'm particularly fond of Raison d'être, and his side projects (Necrophorus "Drifting In Motion" is a must-have). Vidna Obmana is amazing. He also used to work with ritual techno band Hybryds, but that's tangenting a bit.

That should keep you busy for a while! There's a lot of crossover with some experimental/noise stuff, as well as goth/industrial, depending on where you want to look next.