Open source and free shadcn/ui templates by Stack auth (2 templates)

Stack Auth is an open-source authentication platform that serves as a developer-friendly alternative to Auth0 and Clerk, designed specifically for Next.js, React, and JavaScript applications. This comprehensive authentication solution provides everything needed for user management including OAuth integration with popular providers (Google, GitHub, Microsoft), magic link authentication, passwordless login with passkeys, multi-tenancy support for serving multiple organizations, role-based access control (RBAC) for granular permissions, and automatic email notifications for user actions. The platform can be set up in just five minutes and offers both managed cloud hosting and self-hosting options, giving teams complete control over their authentication infrastructure. Built with developer experience in mind, Stack Auth includes pre-built UI components styled with shadcn/ui, TypeScript SDK for type-safe integration, webhook support for custom workflows, and comprehensive session management. Perfect for startups and enterprises building SaaS applications, the platform eliminates the complexity of authentication while remaining extensible and customizable, allowing developers to add authentication to their Next.js applications without vendor lock-in or hefty monthly fees, while maintaining full ownership of user data and authentication flows.

The Stack Auth Multi-Tenant Starter Template is a minimalistic yet powerful foundation for building B2B SaaS applications with multi-tenancy architecture using Next.js 14 and Stack Auth. Built with React, TypeScript, Tailwind CSS, and shadcn/ui components, this template demonstrates how to implement organization-based multi-tenancy where users can belong to multiple teams or workspaces, similar to platforms like Slack, Notion, or GitHub. Stack Auth provides the authentication infrastructure with built-in support for user management, team/organization creation and switching, role-based access control (RBAC) within organizations, invitation systems for adding team members, and OAuth providers for social login. The template includes pre-configured authentication flows with organization context, team switching functionality in the UI, protected routes with organization-level permissions, user profile and settings pages, team management dashboards for admins, and responsive layouts using shadcn/ui components. Developers can quickly build collaborative SaaS platforms where users work in teams, B2B applications requiring workspace isolation and permissions, project management tools with organization hierarchies, customer portal applications with multi-account access, and any application where users need to switch between different organizational contexts. The minimalistic design focuses on essential multi-tenancy patterns without overwhelming complexity, making it easy to understand the architecture and extend with custom features. Stack Auth handles the complex authentication and authorization logic, allowing developers to focus on building unique product features rather than reinventing authentication systems.