We just released node-radius: https://github.com/cobianet/node-radius
MIT License (open source)
This library provides event handlers for incoming radius packets and methods to create and send responses.
We built it to have a much lower level of control with Radius, we are now authorizing and accounting for roughly 8,000 connections per day which are initiated from Mikrotik hotspots.
The code level interface has allowed us to do very interesting and complex things with the Mikrotik radius attributes listed on: http://www.mikrotik.com/testdocs/ros/2. ... radius.php
If you are looking for something simple and quick to setup, use The User Manager. If you are building an integrated system this could be one very important component for you.
Hopefully it can help someone else!
We are all ears for any feedback, comments or questions.