Plan 9 from User Space moved from http://swtch.com/plan9port here. See also the Google discussion group https://groups.google.com/forum/#!topic/plan9port-dev/OqSvUDfwS-M.

9front is a fork of the Plan 9 operating system.

Foundation is a preservation system for users’ personal, digital artifacts. Foundation preserves all of a user’s data and its dependencies—fonts, programs, plugins, kernel, and configuration state—by archiving nightly snapshots of the user’s entire hard disk. Users can browse through these images to view old data or recover accidentally deleted files. To access data that a user’s current environment can no longer interpret, Foundation boots the disk image in which that data resides under an emulator, allowing the user to view and modify the data with the same programs with which the user originally accessed it.

Ugarit is a backup/archival system based around content-addressible storage. This allows it to upload incremental backups to a remote server or a local filesystem such as an NFS share or a removable hard disk, yet have the system instantly able to produce a full snapshot on demand rather than needing to download a full snapshot plus all the incrementals since. The content-addressible storage technique means that the incrementals can be applied to a snapshot on various kinds of storage without needing intelligence in the storage itself - so the snapshots can live within Amazon S3 or on a removable hard disk. Similar to Plan 9's venti, but implemented in Chicken Scheme. Encrypting the backup store (called vault) is supported.

Links to the single UNIX Specification (various versions).

9atom augments the plan 9 distribution with the addition of nupas (new mail system), extra pc hardware support, IL and Ken's fs.

The CSS stylesheet might be interesting.

Scripting extension for Firefox. Used
<a>here</a> to make the appearance of pages more Plan9-like.

Literate programs in Haskell and other languages, also for Plan9port.

This project aims to combine the Plan 9 user-space with the Linux kernel, to offer todays developer an exciting environment combining the best features of both the worlds.

Details about Leopards "Time Machine", which appears to be less sophisticated than Plan 9 venti.