There are three, the ESO pipeline and two provided by the consortium. The latter two come together as the MIA+EWS package. The ESO pipeline is mainly used for quality control immediately after observations and for instrument monitoring. For Science Grade data reduction MIA+EWS is recommended. The IDL-wrapper "MyMidiGui", integrated into the "oyster" environment, is available for MIA+EWS v.1.7.1 (see http://www.eso.org/~chummel/midi/mymidigui/mymidigui.html)

The most recent version of MIA+EWS is v.2.0 (see http://home.strw.leidenuniv.nl/~nevec/MIDI/index.html)