AFAIK MAN currently has four methods of stand alignment.
AGNIS PAPA - Fairly outdated technology but still does the job! Simply a neon tube behind a board with holes cut in it for various aircraft, when you see the tube appear on your aircraft type, you stop.
AGNIS Mirrors - Pretty much a mirror which reflects down to the nose gear
'Traffic Lights' - Not sure on the technical name, but as it says basically just a board with a traffic light type layout which is controlled by someone at the gate.
and finally an airport ops marshaller.
I believe that due to new EU regulations airports can only have two forms of alignment systems now so the Traffic Light system is in the process of being removed at MAN.
Hope that helped