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CAPTHCAs

Currently very weak, simple calculus with non-distorted text for the variables
w:reCAPTCHA though that one other anti-CAPTCHA bot claimed to defeat this 60-65% of the time
KittenAuth
MSFT Azurra project Kitten & puppy CAPTCHA

anti-CAPTCHA bots

PWNtcha by Caca Labs - defeats almost any textual CAPTCHA
That other anti-CAPTCHA bot
User_talk:Maksimchebrukov2018 a.k.a. The /on/troll
User talk:CarltonXSRH a.k.a. MassBot