From Fedora Project Wiki

Legacy Applications

These are the applications currently using the old Fedora Account System. They all need to be upgraded to the new account system somehow.

Python API

This is a list of Fedora applications that are using the Python interface to the old Fedora Account System.

Access the Database

These applications authenticate to the old account system by accessing the database directly.

Apache Auth

These applications authenticate to the old account system through an apache module.