OSes of the future

''These alternative operating systems are usually developed either by enthusiasts or small companies (or both), and there are more of them than you might expect. There are even more than we have included in this article, though we think this is a good selection of the more interesting ones and we have focused specifically on desktop operating systems.
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AmigaOS 4.1
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Haiku [from BeOS]
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MenuetOS, also known as MeOS, is an operating system written entirely in assembly language which makes it very small and fast.
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Some of these look like nice toys to play with :D

Source here.