auth0-b2b-saas-starter

The Auth0 SaaS Starter Kit is a full-stack Next.js + Radix UI application designed to help you get started building B2B SaaS with Auth0. It features multi-tenancy support, organization member management and access controls, security policies, self-service Single Sign-On configuration, and more. Maintained by auth0-developer-hub on GitHub, where it has earned 203 stars from the community.

It's actively developed around auth0, authentication, nextjs, and is a solid reference for anyone building with these tools.