Open source authentication projects
Every project in the registry tagged authentication, ranked by real GitHub adoption.
Open-source backend in a single file
Framework-agnostic authentication for TypeScript applications
Take control of your identity with a secure, flexible solution
Secure, customizable authentication for your applications
Secure, customizable identity infrastructure for developers
Secure, seamless authentication for modern applications
Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!
Serverless backend platform for modern app development
Modular auth, payments, emails, and analytics for your product
Golang gRPC Middlewares: interceptor chaining, auth, logging, retries and more.
Firebase SDK for Apple App Development
Self-hosted cloud platform with automated security
Secure, scalable API key management for developers
Zero-Trust VPN with built-in 2FA/MFA and SSO capabilities
Managed identity and access management for any app
WordPress plugin that lets you use Discourse as the community engine for a WordPress blog
Related tags
Frequently asked questions
How many open source authentication projects are there?
This registry tracks 17 projects tagged authentication, with 229,236 GitHub stars between them. The most-adopted is PocketBase at 61,070 stars.
Are these authentication projects free to use?
Yes — 10 of the 17 carry an explicit open-source licence across 5 distinct licences, so there is no licence fee. Where a project also sells a hosted or enterprise version, the self-hosted path remains free.
Which authentication project should I choose?
The list above is ranked by GitHub stars, but stars measure attention rather than fit. Check three things on each card: the licence (permissive versus copyleft), the language it is written in, and the last-push date — a high-star project that has not been pushed in a year is a liability.
Are these authentication projects still maintained?
16 of the 17 were pushed in the last 90 days, and every card shows its exact last-push date so you can see the rest. Sort your shortlist by that date before committing to a migration.