FreeRadius is described as 'FreeRADIUS is responsible for authenticating one third of all users on the Internet. Welcome to the FreeRADIUS project, the open source implementation of RADIUS, an IETF protocol for AAA (Authorisation, Authentication, and Accounting)' and is an app. There are more than 10 alternatives to FreeRadius for a variety of platforms, including SaaS, Web-based, Self-Hosted, Windows and Linux apps. The best FreeRadius alternative is Keycloak, which is both free and Open Source. Other great apps like FreeRadius are Auth0, Clerk Authentication, Logto and AWS Identity and Access Management.
Does not provide RADIUS functionality.