http://en.wikipedia.org/wiki/AmigaOS
AmigaOS is the default native operating system of the Amiga personal computer. It was developed first by Commodore International, and initially introduced in 1985 with the Amiga 1000. Old versions only run on the Motorola 68k series of 16-bit and 32-bit microprocessors, while the newer AmigaOS 4 runs only on PowerPC
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The current holder of the Amiga intellectual properties is Amiga Inc. In 2001 they contracted AmigaOS 4 development to Hyperion Entertainment and in 2009 they granted Hyperion an exclusive, perpetual, worldwide right to AmigaOS 3.1 in order to develop and market AmigaOS 4 and subsequent versions.[1]