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OpenID Connect Playground - Learn about the standard behind Google SSO
TypingDNA Authenticator - 2FA codes in your browser, secured by the way you type
Amazon SSO - Manage access to multiple AWS accounts & business apps
PropelAuth - PropelAuth hosts and manages your authentication.
TunnelBear - Really simple VPN to browse the web privately & anonymously.
Authorizer - Authorizer is an open-source authentication and authorization solution for your applications.