oauth2

Keycloak is an open source identity and access management solution providing features like single sign-on, identity brokering and social login, user federation, strong authentication, and fine-grained authorization.

Authelia is an open-source authentication and authorization server providing two-factor authentication and single sign-on (SSO) for your applications via a web portal. It acts as a companion for reverse proxies.

Authentik is an open-source Identity Provider focused on flexibility and versatility. It supports multiple authentication protocols and can serve as a self-hosted alternative to commercial solutions like Okta, Auth0, and Entra ID.

Casdoor is an open-source Identity and Access Management (IAM) / Single-Sign-On (SSO) platform with a web UI supporting multiple authentication protocols including OAuth 2.0, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, and more.

OAuth2 Proxy is a flexible, open-source tool that can act as either a standalone reverse proxy or a middleware component integrated into existing reverse proxy or load balancer setups. It provides a simple and secure way to protect web applications with OAuth2/OIDC authentication by intercepting requests and redirecting users to OAuth2 providers for authentication.

ZITADEL is an open-source identity and access management platform with built-in multi-tenancy, providing authentication, authorization, and user management capabilities. It offers both self-hosted and cloud options with features like SSO, OIDC, SAML, and passkey support.

Logto is a modern, open-source authentication infrastructure focused on SaaS and AI applications. It provides multi-tenancy, enterprise SSO, and RBAC capabilities while simplifying OIDC and OAuth 2.1 implementation.

Pocket ID is a simple OIDC provider focused on passkey authentication, allowing users to securely access services without passwords. It provides a streamlined alternative to more complex identity providers.

FusionAuth is a modern customer identity and access management (CIAM) platform that provides authentication, authorization, and user management capabilities. It offers flexible deployment options including self-hosted and cloud-hosted solutions.