One thing that always fascinated me is that although BBSs connected people, they were necessarily constrained by distance given the difficult (and price) of long-distance calls. That reflected on the shape of the community around it. There were some things that would be common between them but overall different area codes had very different scenes. This is somewhat diluted today, since you can connect with whatever community you want. It creates a different sort of bubble.

Anyway, that constraint was also somehow reflected on the choice of tools, maybe in this case especially in the software used by the BBS itself. The US had plenty of different BBS software being used. I know Wildcat was popular in Europe. In my native Brazil it was dominated by PCBoard (major) and Remote Access (minor), and the underground scene was heavily invested in the "cool" Oblivion. I actually thought PCBoard was a major player until I realized very few boards in the USA used it.