"Here's a survey of other operating systems that have also been
built as open source products, are free to use, and generally come
with little to no restrictions over their use. Many of them have
taken strong cues from the way Linux has developed, typically in
the collections of userland tools that are available. Some owe very
little to Linux, apart from the general development philosophy, and
are not architecturally related to Linux in any significant
"So how useful are these operating systems? In the case of BSD
and OpenSolaris, they're already in production deployments all
around the world, so there's little to argue with there. HaikuOS,
ReactOS, Darwin, and Singularity are entirely another story: they
range from being minimally useful on the desktop to only useful as
programming research projects."
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