A curated list of the best, top, and most popular open-source authentication tools available right now. Showing the top 12 of 12 authentication tools in our directory, ranked by GitHub stars.
Appwrite is an open-source backend server for Web, Mobile, and Flutter developers. It provides a set of easy-to-use REST APIs for managing authentication, databases, storage, and more.
Open Source Identity and Access Management solution for modern applications and services, offering single sign-on, user federation, and multi-factor authentication.
Authelia is a Single Sign-On Multi-Factor Authentication portal for web apps, providing secure and streamlined access management.
Bitwarden infrastructure and backend solution for managing API, database, and Docker environments.
ZITADEL is a modern identity infrastructure that simplifies authentication and authorization for developers, providing advanced features like multi-factor authentication and single sign-on.
Enhance your FastAPI application by exposing endpoints as Model Context Protocol (MCP) tools, complete with authentication support.
A user-friendly authentication library designed to be simple and clean for developers.
Nhost is an open-source platform providing a Firebase alternative with GraphQL support.
OpenAuth is a universal, standards-based authentication provider designed to simplify secure authentication for applications.
authgear-server is an open-source authentication server that serves as an alternative to Auth0 and Firebase Auth. It provides secure, flexible, and scalable user authentication and identity management for web and mobile applications.
Easily add authentication to your React applications using React Query, providing a seamless integration for secure and efficient login flows.
Simplify your authentication flow when working with React applications, enhancing security and user experience.
Appwrite is the most popular by GitHub stars right now. Appwrite is an open-source backend server for Web, Mobile, and Flutter developers. It provides a set of easy-to-use REST APIs for managing authentication, databases, storage, and more.
Yes. Every tool on this list is open source and free to use in your own projects. Many can be self-hosted.
Tools are ranked by GitHub star count, a strong proxy for community adoption and active maintenance. Star counts are refreshed regularly.
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