Originally Posted by Boba Rhett
As far as I know, the Sith engine was only used to make JK, MotS, Indy ATIM, Droid Works and somewhat in Grim Fandango.
I've been unable to find the name of the engine used in SotE so far.
Actually on the wiki it says Grim used the GrimE adventure engine.
I think it said somewhere that SOTE used the SCUMM engine from Maniac Mansion.