RDXServer 1.1 for Mac can be downloaded from our website for free. The program belongs to System Tools.
From the developer:
RDXServer is a cross-platform Radius Server, supporting standard Radius Access, Authorisation and Accounting Services. Built under MacOSX with stability, performance, and flexibility in mind, RDXServer handles all remote access authentications scaling from small wireless networks up to large ISP's.
You may want to check out more Mac applications, such as SimpleError, Cookie Assassin or ARTIS Screen Guides, which might be related to RDXServer.