Discussion about nanomsg happens on email@example.com mailing list.
We do ask that discussions on the mailing list be kept on-topic.
There is also an IRC (Internet Relay Chat) room on #freenode for nanomsg. Unlike Gitter, IRC is not persistent, and does not require you to authenticate. Note that owing to its lack of persistency, the nanomsg core team prefers Gitter, so if you need to reach the developers please use Gitter instead.
Join the nanomsg IRC chat from your web browser here.
To access the chatroom from an IRC client connect to irc.freenode.net/8001, channel #nanomsg.
Find the logs of past IRC discussion here.