Secure Send - Securely send passwords or sensitive data
Antideo - Email, IP address and phone number validation API service
FusionAuth - FusionAuth is a CIAM platform that is 100% free for unlimited users.
Numverify - Global phone number validation and lookup API
secure-ls - Secure localStorage data with encryption and compression
RealValidito - Phone Validator | Free Phone Number Validation & Phone Number Lookup Service | Realvalidito