Data breaches & leaks

A website that allows users to check if their personal data has been compromised in a data breach.

A database for searching leaked data, such as passwords and emails.

A service for checking if your email is part of a leaked database.

A tool for checking leaked databases for compromised accounts.

A comprehensive database of vulnerabilities.

An extension for real-time threat intelligence.

A database for reverse hash lookups.

A platform for searching paste sites for sensitive data.

A tool for analyzing breached data. (GitHub link) 

A service for monitoring data breaches and leaks.