LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
have i been pwned? - Check if your account has been compromised in a data breach
Spybot Identity Monitor - Get an overview where your account was leaked.
LeakCheck.cc - Website moved to https://checkleaked.cc Powered by Leakcheck.io. Protect your account, discover its leaks, avoid using insecure passwords. Secure your company and your person, know the passwords and information that hackers already have about you.
DeHashed - DeHashed is the largest & fastest data breach search engine.
Snusbase - The industry leading database lookup.