Plan 9

Acme Stand Alone Complex
Acme is a programmer's editor, shell, and user interface.
http://caerwyn.com/acme/

Contrib Index
Index of software packages part of the 'Contrib' directory in the Bell Labs Sources repository.
http://plan9.bell-labs.com/wiki/plan9/Contrib_index/

9grid.es
Plan 9 resources, sources mirror, documentation and public accounts.
http://sirviente.9grid.es/

NineTimes
News, tips and articles about Plan 9 and Inferno.
http://ninetimes.cat-v.org/

Plan 9 and Inferno at the Google Summer of Code
News, blogs, source code repositories and other resources for the Plan 9 and Inferno projects part of GSoC.
http://gsoc.cat-v.org

Plan 9 from Bell Labs
Wikipedia article about Plan 9.
http://en.wikipedia.org/wiki/Plan_9_from_Bell_Labs

Plan 9 2nd Edition ReadMe by Brian W. Kernighan
General introduction to the system.
http://doc.cat-v.org/plan_9/2nd_edition/README

Second International Workshop on Plan 9
A workshop for researchers and developers working on Plan 9 from Bell Labs, Inferno, and related ideas and projects.
http://plan9.bell-labs.com/iwp9/

The 9term Terminal Emulator
X terminal emulator that mimics the Plan 9 terminal.
http://www.cs.su.oz.au/~matty/9term/index.html

Tokyo Inferno/Plan 9 Users Group
Offers free accounts on public Plan 9 servers, documentation (some in Japanese), mirrors of Plan 9 software, and other resources.
http://www.tip9ug.jp/en/index.html

Upas - A Simpler Approach to Metwork Mail
Essay on the mail interface system by David L. Presotto. Available in PDF and PostScript format.
http://doc.cat-v.org/bell_labs/upas_mail_system/

Vita Nuova Holdings Ltd.
Lead distributor for Plan 9 and Inferno OSs.
http://www.vitanuova.com/plan9/main.html

IWP9 2006
First International Workshop for Plan 9 and Inferno. <small>(December 5, 2006)</small>
http://lsub.org/iwp9/

Reinventing Unix: An Introduction to the Plan 9 Operating System
Technical paper abstract; link to main article, fee needed. Library Hi Tech; Emerald Group. <small>(December, 2003)</small>
http://www.emeraldinsight.com/Insight/viewContentItem.do?contentType=Article&contentId=861398

Plan 9 at the Advanced Computing Laboratory
Documentation, tips, various software packages including ports of Unix software, and extra drivers for 3rd Edition. <small>(April 21, 2003)</small>
http://mirtchovski.com/lanlp9/

Plan 9: The Way the Future Was
Essay compares Plan 9 to Unix, parts of Plan 9 being implemented in Unix. From Eric S. Raymond's book The Art of Unix Programming. <small>(2003)</small>
http://www.faqs.org/docs/artu/plan9.html

Geeks404.com: Plan 9 from Bell
News coverage of the Open Source release of the third edition of Plan 9. <small>(June 16, 2000)</small>
http://linuxtoday.com/news_story.php3?ltsn=2000-06-18-005-04-NW-SW

Bell Labs Innovations: Bell Labs Unveils Open Source Release of Plan 9 Operating System
The official press release. <small>(June 7, 2000)</small>
http://www.bell-labs.com/news/2000/june/7/2.html