C64
Gamebase Amiga
GamebaseST
Atari 5200, Atari 7800, Channel F
GB BBC (v2)
GBElectron (v2)
Acorn Archimedes
Atari 800
Gamebase_Odyssey
Various others - mainly in the Other GameBase Projects section
Known to be in development
Dragon32
The original Gamebase developers site - see the databases section