Female fronted bands

This thread is more than 10 years old. Anyway - Jex Thoth, as mentioned already. From the heavy-metal spectre: Christian Mistress. Old thrash? Détente. I don't know about women growling though, it's opposite to attractive really. Although sometimes you can't really tell just by the sound of it.
 
Holy fucking Moses, as mentioned kicks ass, and not just since they're female fronted.
Some of the best german thrashers out there imo.