Jonathan Nieder [off-list ref] writes:
It looks like most of the Freenode admins have moved to
https://libera.chat/, so that would be a close equivalent. Another
alternative is OFTC <https://www.oftc.net/>, which is used by
irc.debian.org, for example.
There are also other real-time chat programs such as Zulip (open
source, used in Outreachy), Discord (used by LLVM), and Slack (used by
Chromium); each has its benefits and flaws.
I usually refrain from suggesting us to side with anybody in a
confrontation that is outside our main mission, but I do not mind
supporting the folks who were at freenode to show appreciation for
the service they gave us so far, by moving to where they are now.
If all candidates offer similar level of stability and archival,
that is.
Thanks.