JProiCaptcha, from JPro Extensions, is a innovative user friendly secure Captcha plugin for Joomla!™ 3. It's Joomla!™ R3ADY!
JProiCaptcha v3.0.2 allows you to protect your Joomla!™ 3+ forms from spammers and bots. When enabled, it renders automatically on all Joomla!™ system forms - user registration, password reminder, password reset, and contact forms.
Listed on Joomla!™ Official Extensions Directory here.