Seven Open‑Source OAuth and SSO Projects for Developers

Most modern web applications require login, registration, password encryption, and token management; to protect user privacy and simplify usage, OAuth and single sign‑on (SSO) systems have become essential. Below are six (plus one) open‑source projects that address these needs for developers.

1. oauth2‑shiro

Project URL: https://gitee.com/mkk/oauth2-shiro

Integrates Apache Oltu with Shiro to provide a lightweight OAuth2 framework, offering different implementations for web and mobile scenarios.

2. tkey

A single‑sign‑on system designed around the OAuth 2.0 standard. It uses pure HTTP, works on any device or scenario, is stateless across domains, and can be horizontally scaled for high availability.

3. MaxKey

Project URL: https://gitee.com/maxkeytop/MaxKey

MaxKey is an enterprise‑grade IAM and authentication product supporting OAuth 2.0/OpenID Connect, SAML 2.0, JWT, CAS, SCIM and more, offering user identity management, authentication, SSO, RBAC and resource management.

4. spring‑lhbauth

Project URL: https://gitee.com/lvhaibao/spring-lhbauth

Implements authentication and authorization based on OAuth2 and JWT.

5. oauth2

Project URL: https://gitee.com/lyric/oauth2

A Golang implementation of an OAuth 2.0 server following RFC 6749, offering simple, flexible, modular usage with support for in‑memory, file, Redis and MongoDB storage.

6. oauthserver

Project URL: https://gitee.com/jeesun/oauthserver

A complete, standalone OAuth2 server microservice based on Spring Boot; after creating the required tables and configuring the database connection, you obtain a ready‑to‑use OAuth2 server.

7. JustAuth

Project URL: https://gitee.com/yadong.zhang/JustAuth

JustAuth is a third‑party login utility library that abstracts away cumbersome SDKs, making authentication "so easy!". It integrates dozens of platforms such as GitHub, Gitee, Alipay, Weibo, WeChat, Google, Facebook, Twitter, StackOverflow, etc.

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