These are the companies that I know have or have had simulator portions of the interview. Some of them might waive the sim requirement based on applicant qualifications:

Piedmont: Dash 8 simulator (no motion)
Republic/Chautauqua/Shuttle: Fixed Base FTD (Frasca)?
Horizon: Fixed Base FTD (Frasca)?
Compass: 727 simulator (no motion)

Perhaps other folks in the know can add to this list (I haven't been part of the regional hiring scene in quite some time).