I'll list here as many as I can remember. I'm sure I will forget a lot as well.

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Aeneas
Amorgo Quartet
Argy Echosense
Black_Sun
BlosSom (Greek psytrance DJ)
Capitan Transition
Cosy (Lasse)
Crystal Zero
Diogo (Portuguese DJ)
DJane Isis
Dimitris (Amorphia)
Dr Nek
El Mahico
Fluxo (Portuguese DJ)
Frank Panx & Οι Σαλταδόροι
Gaia 604
Interstellar Overdrive
Jako (hip-hop)
John Peggos
Kaede & Loki
Kallima
Lunar (hip-hop)
Malory Goa
Martin Equalizer
Mike Sync
Motel Room 35
Mysticism
Nikitas
Ostatni
DJ Pascal
Peukotrance
Rolling Stoned
Sativarious Joe
Shades Of Blue
Stavros Ahimsa
Tabatakash Fanfare
Tiffany (GR)
Vorpal
X-Dimension
Αγία Φανφάρα
Κατράμι