Amiga models and variants

This is a list of models and clones of Amiga computers.
Development.
The first Amiga computer was the "Lorraine" developed using the Sage IV system. It consisted of a stack of breadboarded circuit boards.
PowerPC-based AmigaOS models (post Commodore).
Note these models are not hardware compatible with the 68k Amigas.
Video chipsets.
Chipsets with introduction year in parenthesis were planned but never fabricated.
Other AmigaOS compatible computers.
Some computers were released by other companies which were AmigaOS compatible.
Unreleased models.
Prototypes:
Due to management turmoil, some viable Amiga models under development were cancelled prior to release:
Unreleased models (after Commodore).
A number of new Amiga models were announced after the end of the Commodore model era. However, very few of them were ever produced beyond simple prototypes (if they even got that far). Some of these were announced by companies who later owned, or sought to own, the Amiga rights. Others were unofficial machines which would run AmigaOS, whilst others still were intended to run an operating system compatible with Amiga software. Some models that were never produced include: