FreeRADIUS/freeradius-server

FreeRADIUS is a high-performance, highly configurable multi-protocol policy server that supports RADIUS, DHCPv4, DHCPv6, DNS, TACACS+, and VMPS. It centralizes authentication and authorization for network access, minimizing changes when adding or deleting users. FreeRADIUS can authenticate users on systems such as 802.1x (WiFi), dialup, PPPoE, VPNs, VoIP, and many others. It supports a wide range of back-end databases including MySQL, MariaDB, PostgreSQL, Oracle, Microsoft Active Directory, Apache Cassandra, Redis, OpenLDAP, and more. Used daily to authenticate Internet access for hundreds of millions of people, from small sites to those with over 10 million users. The project is available under the GNU GPLv2. Notably, the project recommends using AI tools for analyzing configurations rather than generating them, as AI-generated configurations are often incorrect.