Ask HN: What IRC / Matrix channels do you hang out on?

I was a big fan of IRC in the 90es and 2000s, but these days IRC seems relatively dead. I’m trying to hang out on Linux and open source channels on Freenode, but most of them are support related. I really miss the underground atmosphere of IRC with idling, homemade bots and what not. Does anyone here still hang out on IRC or Matrix and where? Where should I find my digital social life? (PS - I’m in Australia and I don’t like Facebook, Reddit or Twitter.)