It was only recently that I heard of Straight Line Stitch, a hardcore band that has an amazing female vocalist named Alexis Brown. I was blown away by the energy of the band and Brown is one of the better female vocalists that does the whole growling thing.
Below are two videos. The first is a new video for the song "Taste of Ashes" featuring Jamey Jasta of Hatebreed. The second is a previously released video for a kickass track called "Black Veil".