Open-source alternatives to Doorkeeper

Authlib is a comprehensive Python framework for implementing OAuth 1.0, OAuth 2.0, and OpenID Connect clients and servers. It provides a complete toolkit for identity management, spanning the development of authorization servers, resource servers, and client-side integrations. The library distinguishes itself through a full implementation of the JOSE specifications, including JSON Web Tokens, Encryption, Signatures, and Keys. It features specialized capabilities for non-interactive authentication via service account assertion frameworks and a compliance-correction layer designed to handle ide

Hydra is a headless identity server that functions as a certified OAuth2 and OpenID Connect provider. It is designed as an authentication engine that manages authorization handshakes and token lifecycles while remaining decoupled from the user interface. The project distinguishes itself through a headless architecture, allowing external management of login and consent flows. It provides specialized capabilities for dynamic client registration, JSON Web Token issuance, and a system for rotating encryption secrets without service downtime. The system covers a broad range of identity operations

node-oauth2-server is an OAuth2 server implementation for Node.js that functions as an authorization provider. It enables the creation of a centralized server to manage client registration and issue access tokens for third-party applications using the OAuth2 protocol. The project operates as Node.js middleware, integrating authorization logic directly into web application request pipelines. It provides a bearer token validator to verify identity and permissions by checking security tokens within incoming HTTP request headers. The system covers API access control, token management, and user a

This project is a .NET identity stack and server framework used to build certified OpenID Connect and OAuth 2.0 identity providers. It provides the core logic required to issue and validate security tokens and manage user authentication across various grant types and protocol flows. The framework includes a protocol translation layer that bridges OpenID Connect and SAML to enable interoperability between different identity providers. It also supports a stateless mode of operation, which removes built-in validation and storage to allow for manual control over token and client verification. Th

node-oidc-provider is a framework for building OpenID Certified authorization servers and identity providers within Node.js environments. It provides a comprehensive suite of tools for managing the full lifecycle of OAuth 2.0 and OpenID Connect services, including user authentication, client registration, and the issuance and validation of identity and access tokens. The project distinguishes itself through a highly modular architecture that allows developers to integrate authentication services directly into existing web application stacks. It supports advanced customization through a middle

This is a JSON Web Token authentication package for the Django REST Framework that manages stateless user identities. It serves as an authentication provider and token manager used to issue and validate signed tokens to maintain user sessions across multiple requests. The project implements a dual-token lifecycle, issuing short-lived access tokens and long-lived refresh tokens to balance security with session persistence. It features token rotation to prevent replay attacks and a blacklisting system to invalidate compromised credentials. Additionally, it supports sliding-window expiration to

This project is an authentication and authorization platform built on the Spring framework that functions as a centralized identity provider and authorization server. It manages user identities and protects resources by implementing standardized protocols to verify credentials and issue secure tokens for web applications. The platform distinguishes itself by providing a comprehensive framework for managing complex authorization flows and identity verification. It supports dynamic client registration to automate the onboarding of third-party applications and utilizes relational database persis

SuperTokens Core is an open-source, self-hosted authentication and identity management platform designed for deployment within private infrastructure. It provides a comprehensive suite for managing user accounts, roles, and secure authentication flows, utilizing a modular, recipe-based architecture that allows developers to enable specific security features without modifying the core codebase. The platform distinguishes itself through its robust multi-tenancy capabilities, which allow for the logical or physical isolation of user records and configuration settings across different organizatio

GoTrue is a JWT identity provider and user management API. It functions as an OAuth 2.0 compliant server that handles user registration and authentication while issuing signed JSON Web Tokens to control access to protected API resources. The service integrates external identity providers to allow users to sign in using third-party accounts. It also includes an SMTP notification service for delivering password resets, signup confirmations, and account recovery emails. The system covers broader capabilities for user account management, including the ability to update user profiles and manage c

Dex is an OpenID Connect provider and identity federation proxy that translates authentication signals from various upstream sources into a unified OpenID Connect interface. It functions as a multi-protocol identity broker, enabling client applications to implement a single standard while delegating user verification to external identity providers. The project distinguishes itself through a pluggable connector architecture that bridges disparate protocols including LDAP, SAML, and OAuth2. It provides specific integrations for services such as GitHub, Google, GitLab, and Microsoft, while offer

Spring Authorization Server is an OAuth 2.1 and OpenID Connect 1.0 authorization server built on Spring Security. It implements the full protocol surface for issuing access and refresh tokens, including authorization code, client credentials, device code, and token exchange grants, as well as pushed authorization requests and user consent management. The server also functions as an OpenID Connect provider, supporting ID tokens, userinfo, discovery, logout, and dynamic client registration. The project distinguishes itself through an extensible framework that allows custom grant types, pluggabl

This project is a JSON Web Token implementation library and toolkit for encoding, signing, and validating tokens. It provides the necessary functions to manage token claims and payloads for user authentication and authorization. The library supports both symmetric and asymmetric cryptography, allowing for the use of shared secrets or public-private key pairs. It enables the creation of signed tokens and the verification of their authenticity and integrity to prevent data tampering. The toolkit covers a broad range of identity and access control capabilities, including the embedding of custom

Grant is an OAuth authentication proxy that interfaces applications with third-party identity providers to manage handshakes and token exchanges through a transparent proxy layer. It provides a secure OAuth client implementation that validates OpenID Connect tokens and manages multi-provider identity under a unified configuration. The project differentiates itself through support for serverless authentication flows, allowing the proxy logic to be deployed as cloud functions. It implements advanced security mechanisms including Proof Key for Code Exchange and private key JWT authentication to

Octelium is a zero-trust network access platform and identity-aware proxy designed to secure private HTTP, SSH, and SQL resources. It functions as a secure gateway that validates human and workload identities using OIDC, SAML, and FIDO2 passkeys before granting access to internal applications and SaaS APIs. The system is distinguished by its secretless access broker, which injects credentials—such as API keys, passwords, and AWS Sigv4 signatures—at the gateway level so users can access databases and cloud resources without managing secrets. It further specializes in AI gateway administration,

Authorizer is an open-source identity provider that functions as a centralized authentication and authorization platform. It manages user identities and session lifecycles by implementing standard OpenID Connect protocols, allowing for secure verification across web, mobile, and backend applications. The service is designed as a containerized microservice that provides a unified interface for administrative and authentication operations. The platform distinguishes itself through a multi-tenant architecture that isolates authentication rules and user data across different business domains. It

Libredesk is an omnichannel support management system designed to unify live chat and email communications into a single dashboard. It provides a comprehensive environment for managing customer interactions, agent roles, and team assignments to organize support workloads. The project distinguishes itself through AI customer support automation, which includes generating automated responses and refining message tones. It also supports the development and integration of custom chat widgets using WebSockets and JavaScript APIs. The system covers a broad set of capabilities, including customer re

This project is an OAuth security framework for Java web applications. It provides a set of tools for adding authentication and authorization to Spring applications using standardized delegated authorization protocols. The library implements both OAuth 1.0a and OAuth 2.0 standards. For OAuth 2.0, it includes implementations for both the client side, to request access tokens and consume protected resources, and the provider side, to issue access tokens and manage authorization grants. The framework covers API authorization workflows, securing communication between applications, and managing d

OpenCloud is a self-hosted platform for synchronizing files across devices and sharing them with team members through collaborative spaces and access controls. It enables users to sync files between a server and local desktop and mobile clients, manage files and folders, and share content with internal and external contributors via permission-based links and file drops. The platform integrates an embedded OpenID Connect identity provider for authentication and supports external identity providers. It stores all data and metadata directly on the filesystem, eliminating the need for a separate

docker-socket-proxy is an HAProxy-based security proxy that filters and controls access to the Docker API. It acts as a security layer between containers and the Docker socket to restrict API operations based on specific paths and methods. The proxy uses environment variables to enable or disable specific API endpoints and to grant or revoke permissions for various API sections. It can enforce read-only access by restricting the API to only allow GET and HEAD requests, returning a forbidden status for unauthorized actions. The project provides capabilities for path-based request filtering, c

Dex is an OpenID Connect identity provider that functions as an identity federation gateway. It authenticates users and issues signed tokens for applications by using a variety of pluggable connectors to interface with external identity sources. The project focuses on federating multiple external identity providers into a single authentication portal. It maps diverse external authentication sources to a uniform internal user representation and manages the orchestration of authorization handshakes between clients and identity sources. Capability areas include centralized user authentication,

This library is a PHP toolkit for managing OAuth 2.0 authentication flows and connecting applications to external service providers. It provides a standardized framework for handling token exchanges, managing authorization grants, and retrieving user profile information from diverse identity platforms. The project is distinguished by its inheritance-based provider pattern, which allows developers to build custom integration clients by extending base logic to support unique service workflows and non-standard API specifications. It employs interface-driven contracts to ensure consistent behavio

This project is an AI model API gateway and proxy server designed to provide a unified interface for interacting with diverse artificial intelligence service providers. It functions as a centralized middleware platform that routes, load balances, and translates API requests across multiple models, enabling developers to access text, image, audio, and video generation capabilities through a single, standardized integration. The gateway distinguishes itself through comprehensive administrative and financial controls, including event-driven usage accounting, real-time token consumption tracking,

Spotipy is a Python client library for interacting with the Spotify Web API. It provides a programmatic interface to manage music data, user accounts, and media playback. The library implements a full OAuth 2.0 client capable of handling authorization codes, client credentials, and implicit grants. It includes a token manager that supports automated token refreshing and pluggable caching backends to maintain stateful sessions. The project covers music metadata retrieval and search, allowing for the lookup of artists, albums, and tracks via resource identifiers and URIs. It also provides capa

Yopass is a secure secret sharing platform used to share encrypted text and files via one-time expiring links. It utilizes client-side encryption to ensure that sensitive data is encrypted in the browser before transmission, preventing the server from seeing plain text. The platform differentiates itself through an integrated security auditing system that generates structured logs and triggers cryptographically signed webhooks when secrets are created, viewed, or expired. It also features an access control system based on OpenID Connect, allowing administrators to restrict secret creation and

This is a Go backend template that structures a web service into domain, usecase, controller, and repository layers with strict dependency inversion. It provides a foundation for building maintainable and testable REST APIs by separating business logic from transport and data access concerns. The project implements JWT-based authentication, issuing access and refresh tokens for user signup, login, and protected endpoint access. It uses the Gin HTTP framework to build a Docker-packaged REST API with public and private route groups, request validation, and middleware-based authentication. Depen

This project is a REST API client library and Google Cloud SDK component that integrates Python applications with Google services. It functions as a discovery-based API client, utilizing an OAuth 2.0 integration library to secure requests and verify identity through access tokens and service accounts. The library is distinguished by its use of discovery documents to dynamically generate clients at runtime. By parsing JSON metadata, it maps Python method calls to HTTP requests and builds interface-based resource models that mirror the hierarchical structure of the remote service. Its broader

This backend starter template provides a modular structure for building REST APIs using Node.js, Express, and MongoDB. It includes predefined database models, schema-driven validation, and structured routing to facilitate the development of server-side applications. The application incorporates authentication and security features centered on user registration, login flows, and credential verification. Passwords are protected using cryptographic hashing, and access to protected endpoints is managed through signed token issuance and middleware-based route protection. Additional identity manage