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7 Free Operating Systems Not Based on Linux, Windows or OS X

Microsoft’s recent decision to offer FreeBSD images in the Azure cloud is a reminder that GNU/Linux is not the only game in town when it comes to alternative operating systems.

Here’s a look at lesser-known operating systems. Some are serious, production-quality systems. Others are whimsical or half-baked platforms. All present alternative options for people who want to experiment with something other than Windows, Mac OS X or Linux.