Numverify - Global phone number validation and lookup API
Smarty - Smarty provides address validation, autocomplete, geocoding and reverse geocoding services covering addresses in over 240+ countries.
Antideo - Email, IP address and phone number validation API service
Addressy - Addressy is address verification software that captures and verifies addresses on websites.
RealValidito - Phone Validator | Free Phone Number Validation & Phone Number Lookup Service | Realvalidito
ClickToAddress - ClickToAddress offers APIs for address lookup and verification.