The Common Link
In Sweden an enthusiast called Ulf Hedlund wrote a BBS system based on the university KOM system. It was called TCL and had strengths in its ability to thread topics and avoid a hierarchical menu system. It was tuned for discussions, so paradoxically I set up a BBS based on it which was a file tank using the fast HST modems which became available in the late 80's. I brought it with me when I moved back to England in 1993. I tried to make it bomb-proof. In 1996 we had a robbery which cleaned out all my tech stuff except for the BBS computers, which were caseless. I no longer had any way of administering it, but it ran continuously for 3 years until the power supply on the server failed.