NoPass.me - Open-source identity verification
Veriff - Smart and scalable identity verification.
Amazon Cognito - Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. It scales to millions of users and supports sign-in with social identity providers and enterprise identity providers via SAML 2.0.
Yoti - A simple, secure way to store and prove your identity
Civic Token - Access to identity verification via the blockchain
IDology - IDology offers real-time and on-demand identity verification and fraud prevention solutions.