angry tapir writes "Some might be surprised, but AmigaOS still exists — and is being actively developed. Although though now it runs on PowerPC architecture instead of Motorola 68k chips, AmigaOS 4 is based directly off the 3.1 AmigaOS source code. AmigaOS 4 development is currently being run by Hyperion Entertainment, which is developing it on a commercial basis. I recently had a chance to chat to Steven Solie for a long interview about the system, how it has endured and what the future plans for the operating system are (including whether it will ever be open sourced)."
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