EP> I know of some, but I'd like to hear from you about BBS software that
 EP> you know runs on Linux. Then maybe we can have an FAQ fo this echo.

Mystic was the first DOS-based package ported to Linux back in the 90s and its
still actively developed now (and always has been free).  Its available for
Windows, Linux, OSX, and ARM Linux (Raspberry Pi).

http://www.mysticbbs.com

Synchronet, BBBS, MBSE, and Daydream are some others I know are still
maintained and have Linux versions, although the last two I don't know what
their status is.  I can't think of any more off hand.

--- Mystic BBS v1.10 A52 (Windows)