HawkPost - Submit your content securely
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
TunnelBear - Really simple VPN to browse the web privately & anonymously.
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.