RIP Freenode. Ye are yet one more IRC diaspora amongst the many before, but being one of the last major holdouts of IRC, I do believe this to be the end of an era. Godspeed.
(I haven't really used irc in maybe a decade, but I think I'll go work out what software I should use to chat on Libera Chat... Is scary devil monastery still a thing?)
The libera.chat website has some guidance on IRC clients[0] but personally I'd recommend HexChat[1]. It's as close to a reference implementation of irc as you can get.