OpenIndiana is a robust enterprise operating system, based on the illumos kernel. When Oracle dropped OpenSolaris, many developers regrouped to form OpenIndiana. It is open source, free to use, community developed, and suitable for servers and desktops. OpenIndiana aims to be binary and package compatible with the upcoming Solaris 11, and most of the operating system is built from source code that Oracle continues to make available.

See http://openindiana.org/

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