NoPass.me - Open-source identity verification
NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
Velix.ID - Frictionless Identity verification through Blockchain
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
Identity Verification Tooling - Identity verification software for your in-house KYC team
DeBounce - Email Validation, Email Checker, Data Enrichment and Appending Tool. Using DeBounce remove invalid, disposable, spam-trap, syntax and deactivated emails.