Have I Been Sold? - Check if your email address was sold without permission
PrivacyBot - A simple way to start exercising your privacy rights
Hacksy by Decoded - Check if your data has been leaked & get a better password
Ethereum Name Service - Like DNS, but for Ethereum wallet addresses
Optery - See the private info data brokers post about you online
LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries