Writertopia was originally built with the Ruby on Rails framework and rearchitected for Google App Engine in 2009.
The Authorization plugin was released under an MIT open source license in 2006.
Since that time, it has been widely adopted and received considerable enhancements from other Rails developers. Moderation of the project has also been shared with several active Rails developers.
Links for the Rails Authorization Plugin
The main source repository can be found at the Github main repo.
The plugin test source code can be found at the Github test repo.
The plugin message board can be found at the Google Groups for the Authorization Plugin.