H8mailEmail OSINT & Password breach hunting tool, locally or using premium services. Supports chasing down related email
pAppwordsVanilla JS plug-in with zero configuration integrate with HaveIBeenPwned API v2
hibpwnedPython API wrapper for haveibeenpwned.com (API v3)
BLUELAYSearches online paste sites for certain search terms which can indicate a possible data breach.
tlsassistantFully-featured tool that combines state-of-the-art TLS analyzers with a report system that suggests appropriate mitigations and shows the full set of viable attacks.
Leakfa.comA simple way to know if you are on the list of major security breaches like "HIBP", but it is specific for Iran.