F2F writes "Plan 9 from Bell Labs Fourth Release was announced yesterday marking a major overhaul of the entire operating system. VMware images are now supported, together with hoards of new hardware. The operating system now sports a new security model (on top of the old one, which was already quite secure), new network-resident secure storage system and improvements in the thread library, among others. See the release notes here: release4 notes or simply go to the download page at: plan9 download." T. adds: erikdalen sent in these links to critiques of the Plan 9 license from Richard Stallman and Nathan Myers.
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