Following up a post on Sat, 09 May 2015, from Nicholas Boel to Shawn Highfield:

 SH>    Those are the major ones!  I would say Maximus doesn't count 
 SH> though as it's not really usable. ;)  There was a RA clone (like 
 SH> MBSE) a number of years ago that was amazing, but I can't remember 
 SH> the name, and I wish I could because it would be a good one to 
 SH> find the source for.

 NB> Wasn't that EleBBS?

if it were elebbs, the pascal source is definitely available... it is also
FPC compatible, i think... maybe not... it may have been VP compatible... i
don't recall but i have it here from its github repository ;) maybe not the
absolute latest but i do have what is there... IIRC, a fella in Z3 might
have more up to date sources... the question is if and how they may be
available...

)\/(ark