Best Open Source auth Libraries

A curated list of the most popular GitHub repositories tagged with auth. Select any project to visualize its architecture and dive into the codebase using RepoMind's AI engine.

#1supabase/supabase

The Postgres development platform. Supabase gives you a dedicated Postgres database to build your web, mobile, and AI applications.

97,966TypeScript

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#2nextauthjs/next-auth

Authentication for the Web.

28,085TypeScript

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#3casbin/casbin

An authorization library that supports access control models like ACL, RBAC, ABAC in Golang: https://discord.gg/S5UjpzGZjN

19,854Go

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#4casdoor/casdoor

An open-source AI-first Identity and Access Management (IAM) /AI MCP gateway and auth server with web UI supporting MCP, A2A, OAuth 2.1, OIDC, SAML, CAS, LDAP, SCIM, WebAuthn, TOTP, MFA, Face ID, Google Workspace, Azure AD

13,034Go

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#5microg/GmsCore

Free implementation of Play Services

12,316Java

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#6invertase/react-native-firebase

🔥 A well-tested feature-rich modular Firebase implementation for React Native. Supports both iOS & Android platforms for all Firebase services.

12,250TypeScript

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#7golang-jwt/jwt

Go implementation of JSON Web Tokens (JWT).

8,912Go

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#8stack-auth/stack-auth

Open-source Auth0/Clerk alternative

6,706TypeScript

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