What about Zulip?

[ammaraskar]

According to

Python-committers is dead, long live discuss.python.org

Hello committers, since this got pretty long, here’s the tl;dr: we’re at the point where it is hard to make mailing lists work for us; we’re switching to Discourse; it’s better in many ways; go to https://discuss.python.org/ and create your account there; please do not post to python-committers for the remainder of the year to give Discourse a real shot. And now the long version. What’s the issue? During the core sprint in Redmond we discussed how we discuss. The overwhelming feel is that …

Zulip will act as a replacement for IRC whereas discourse is for the mailing lists.