On 08/18/14, Vince Coen said the following...
 
 VC>  > I know of some, but I'd like to hear from you about BBS software that
 VC>  > you know runs on Linux. Then maybe we can have an FAQ fo this echo.
 VC> 
 VC> Mbse available via sourceforge works well with Linux, mind you it is
 VC> only for Linux/*nix and OSX.

There is also a Linux port of Mystic BBS available, too :)

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