FusionAuth provides enterprise-ready auth, registration, login, MFA, SSO, user management and more. 100% free for unlimited users. Built for developers, it installs in minutes for any size web or mobile application from start-up to unicorn to enterprise. FusionAuth provides secure, single-tenant, on-prem or private cloud identity with social login, custom emails with localization, customizable registration branding, group-based authentication and more. Deploys on macOS, Linux, Windows, and cloud servers as well as any dev box for local development. Docker and Kubernetes images also available.