Nope, the content is effectively hand written (although the items and spells are imported) either by the Project EQ (aka PEQ) team, or by the server developer (if it's a custom server).
The repack and most of the wikki guides will refer you to using the PEQ database. PEQ goes up to and including GoD, with Tacvi the last zone to do (I think).
Mercs are mostly implemented, see the stickies in the forum here:-
http://www.eqemulator.org/forums/forumdisplay.php?f=590