have i been pwned? - Check if your account has been compromised in a data breach

Hashcast - Hashcast monitors leakage of your company’s emails and passwords on the Web, including the deep and dark web.

Secureito - Secureito is a platform that gives everyone the opportunity to find out if their email has been compromised.

LeakCheck - Data breach search engine, low price starting from $10/mo, one email address for free, unlimited API, 7B+ entries

Identity Guard - Identity Guard offers personalized identity theft protection, secure credit monitoring, and credit protection. Learn how Identity Guard can help today!

Hacksy - Security bot to make recommendations and update you on personal data leaks.