NoPass.me - Open-source identity verification
DottedSign - The Best E-Signature Solution for Your Business
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.
PandaDoc - Boost your revenue with PandaDoc. A document automation tool that delivers higher close rates and shorter sales cycles. We've helped over 30,000+ companies.
0xcert - Your ID, degree or house. 0xcert-ified on the blockchain
LibreSign - O LibreSign (assinatura eletrônica) permite que documentos sejam assinados de forma segura e com validade jurídica.