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by herio 1775 days ago
Yup.

They also were not developed by the same company. 3.5 and 3.9 were developed by Haage & Partner, 3.1.4 and 3.2 were developed by Hyperion Entertainment.

There's even an AmigaOS 4.0 from Hyperion which is PowerPC only.

For extra bonus points, there's MorphOS which is a heavily AmigaOS influenced OS. PowerPC only, runs on some of the older PPC Macs.

And there's also the open source AROS reimplementation of AmigaOS 3.1 (with a lot of extras).

(I'm sure I got a lot of details wrong, been years since I last did Amiga stuff.)