GX-01 Mazinger
GX-01R Mazinger (revised)
GX-01B Black Mazinger
GX-01RG Gold Mazinger
GX-01X Mazinger Base stand
GX-02 Great Mazinger
GX-02R Great Mazinger (revised)
GX-02B Black Great Mazinger
GX-03 Combattler
GX-03B Black Combattler
GX-04 Grendizer
GX-04S Grendizer with Marine and Drill Spacer
GX-04X Marine and Drill Spacer?
GX-04B Black Grendizer
GX-05 Daiku Maryu Gaiking
GX-05R Daiku Maryu Gaiking (revised colors)
GX-05B Black Daiku Maryu
GX-06 Getter Robo (3 figure set)
GX-06M Metal color Getter Robo set
GX-07 Mazinger OVA version
GX-08 Aphrodite A
GX-09 Minerva X
GX-10 BossBorot
GX-10B Black BossBorot
GX-11 Dianan A
GX-12 Venus A
GX-13 Dancouga
GX-13R Dancouga (revised, soon to be released)
GX-14 EVA-01 (purple)
GX-15 EVA-02 (red)
GX-16 EVA-00 (blue)
GX-17 EVA-00 (yellow)
GX-18 Getter Dragun
GX-19 Getter Liger
GX-20 Getter Poseidon
GX-21 EVA-03 (black)
GX-22 EVA-04 (chrome) (thanks for the correction Blaine23)
GX-23 Zanbot (soon to be released)
I think that's it, but I have a feeling I'm missing something....