APPLE: MACINTOSH: MANSION
Author: Mark Toland, as well as James Podlasek and Jim Creighton (aka Zsys)
Additional Notes:
This from the description of Mansion 1.956:

"Mansion 1.956 - Until the release of Mansion 9.1.1, the Mansion BBS software has been a commercial product. Mansion is a FULL featured BBS system, completely configurable, including a full scripting language allowing you to customize your BBS System to almost anything you want. Mansion BBS is highly supported anis used throughout the world. Mansion is an excellent choice for businesses, public systems, Fidonet, and much more. Mansion was changed to shareware with the only restriction being that you are limited to 2 users until you register your copy."