For discussion of the jack server as well as jack applications. If you’re doing anything with jack, you need to be on this list. See linux-audio-dev for email prior to 27 Nov 2001.
Not dedicated to JACK alone, but very often you will get help on questions about usage and troubleshooting with JACK here.
jack @ freenode
For those that prefer real-time chat. Requires registration with freenode services.
Join channel #jack on irc.freenode.net. (web chat)
linux-audio-users @ freenode
For more casual talk, use #lau or #opensourcemusicians channels. (web chat)
A general resource for Linux Audio related questions. The WIKI also contains information about JACK and related topics.
Provides a discussion forum for Linux audio related topics. Of course JACK included.