DeHashed - DeHashed is the largest & fastest data breach search engine.
Have I Been Sold? - Check if your email address was sold without permission
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries
Optery - See the private info data brokers post about you online
Snusbase - The industry leading database lookup.
Creep Alert - Check if friends or colleagues track you via email