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Engity's answer:
We use Go for the backend and TypeScript with React for the frontend. We also rely on the OpenID Connect protocol and Security Assertion Markup Language (SAML). As algorithm for passwords we use Argon2, AES256 for data encryption and TLS 1.2+ for transport encryption. For signing JSON web tokens, we work with the Elliptic Curves Digital Signature.
Keycloak - Open Source Identity and Access Management for modern Applications and Services.
IdentityServer - An open-source, standards-compliant, and flexible OpenID Connect and OAuth 2.x framework for ASP.NET Core
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
ASP.NET Identity - ASP.NET Identity is a membership-based software system designed for the authentication and authorization of the users via building an ASP.NET application.
Okta - Enterprise-grade identity management for all your apps, users & devices
DotNetOpenAuth - DotNetOpenAuth is a free-to-use compiled library that comes with the real support to your site visitor to login with the help of openIDs via getting control of the ASP.NET control onto the page.