Zentyal is recommended for small to medium-sized businesses, educational institutions, and IT departments looking for a straightforward, integrated server solution. It is particularly useful for those needing a manageable learning curve while implementing features like directory services, mail servers, and network management.
Auth0 - Auth0 is a program for people to get authentication and authorization services for their own business use.
ClearOS - A very good alternative for Windows Server, for free
Spring Security - The Spring portfolio has many projects, including Spring Framework, Spring IO Platform, Spring Cloud, Spring Boot, Spring Data, Spring Security...
FreeIPA - FreeIPA is an integrated security information management solution combining Linux (Fedora), 389...
JSON Web Token - JSON Web Tokens are an open, industry standard RFC 7519 method for representing claims securely between two parties.
NethServer - NethServer is an operating system for Linux enthusiasts, designed for small offices and medium...