haveibeenpwned.com
Public breach-awareness service for checking whether an email address appears in known data breaches.
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leakedpassword.com
Exposure checker for seeing whether a password or email appears in known breach data.
monitor.mozilla.org
Mozilla service that checks email addresses against known breaches and explains protective steps.
cybernews.com
Cybernews checker for seeing whether an email or phone appears in known data leaks.