Spybot Identity Monitor - Get an overview where your account was leaked.
Snusbase - The industry leading database lookup.
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
LeakedSource - LeakedSource is an online website that is created for dedicated professionals with digital security and privacy in mind.
NuclearLeaks - The biggest free-to-download collection of publicly available website databases for security researchers and journalists.
MyPwd - Find out if your email and password have been leaked