There's an odd subgenre of 'women-fronted doom/stoner band clearly inspired by Sabbath'. Aside from Castle Rat, check out Druidess and Hail Darkness.
Try also: Theatre of Tragedy, Lacrimosa's ‘Not Every Pain Hurts’ (unfortunately rare in their oeuvre), UneXpect's ‘In a Flesh Aquarium’, Funeral, Haggard and perhaps Garmarna. And of course Babymetal.