From what I remember: n64: original release
gc: collector's edition, oot + master quest bonus disc
wii: virtual console
wii u: virtual console
switch: via the nintendo switch online thing

iQue: the iQue release (might be the only Chinese-language release?)

3ds: oot 3d
switch 2: upcoming remake

Total: 9 releases
(not counting updated re-releases, like n64 1.0, 1.1 & 1.2)

Edit: formatting