9fans is a list for discussion about Plan 9 and related technologies.
To subscribe you can send an email to 9fans-request@9fans.net with "subscribe 9fans" as the body or use the web form at: http://mail.9fans.net/listinfo/9fans
See the 9fans page for a discussion of archives and gateways.
We have two mailing lists specific to Google Summer of Code:
You can also email 9trouble@plan9.bell-labs.com for support or report bugs. But probably using 9fans is a better idea as the persons taking care of 9trouble are usually very busy.
Vita Nuova runs an Inferno Mailing List for the discussion related to the Inferno operating system and the Limbo programming language.
To subscribe to the list, send a message to inferno-list-request@vitanuova.com, including the word "subscribe" in the subject or body of the message.
List archives:
The following lists are not actively used. Their archives are listed for the curious.