FreeRADIUS - A multi-protocol policy server.

Paul's PPP Package: PPP daemon and associated utilities | Official GitHub repo: https://github.com/ppp-project/ppp

This is the PAM to RADIUS authentication module. It allows any Linux, OSX or Solaris machine to become a RADIUS client for authentication and password change requests.

A simple RADIUS client library

The FreeRADIUS Apache module for RADIUS authentication

nginx radius module

RADIUS authentication script for OpenVPN

Secure router - reference implementation

linux port of actual libradius offered by freebsd

Plain C99 RADIUS AAA library (With optional reference C++ wrappers, server and client)

Official portable version of OpenBSD radiusd (WIP)

billing based radius-cistron server (for dialup & VPN) with mysql

Unofficial archive of latest (2008-12-17) GNU Radius 1.6.1 by Free Software Foundation, Inc.

Official portable version of OpenBSD libradius (WIP)

An OpenVPN plugin for RADIUS authentication