User Management GitHub Repositories (2026) · Open Source Tools

Modern authentication, on your terms. Open source alternative to Auth0, Clerk, WorkOS, Stytch.

Frontier is an all-in-one user management platform that provides identity, access and billing management to help organizations secure their systems and data. (Open source alternative to Clerk, WorkOS)

Admidio is a free open source user management system for websites of organizations and groups. The system has a flexible role model so that it’s possible to reflect the structure and permissions of your organization.

High-performance API and AI Gateway

Goiabada is an OAuth2 / OpenID Connect server written in Go.

FusionDirectory is a modern, efficient and secure Identity Management (IAM) solution.

A web application to manage complex group hierarchies with members, events and a lot more.