Guitar Pedal X - GPX Blog - Black Mass's 1312 V3 Rat-style Distortion is another worthy contender with 8 Great Clipping Options and 18V charge pump onboard
Lone Wolf Audio Plague Rat Distortion | Reverb
RAT Distortion - The Plague of RATS on display at the RapcoHorizon Booth during the 2016 Winter Namm Show. Thank you to all of you for stopping by last week! | Facebook
Most metal RAT-style pedal (in no particular order) : r/guitarpedals
Guitar Pedal X - GPX Blog - Best of Mini, Compact, Medium and Large Rat Style Fuzz/Distortion Pedals