Respond tools are used to take appropriate action after learning of a security event, this tools include;
Breach Alarm
Breach Alarm crawls the deep parts of the internet to discovery if your credentials have been compromised. Simply put in your email address and it will tell you whether or not you should change your password.
Have I Been Pwned?
Have I been pwned tracks large data breaches and crawls the internet looking for list and databases of compromised account. Enter your email address and it will tell you if any of your accounts have been published anywhere.