Libera.Chat has arrived and marketed itself as the successor to Freenode:
We’re excited to announce the launch of Libera.Chat, and welcome you to a next-generation IRC network for free and open source software projects and similarly-spirited collaborative endeavours.
How do I make an SASL connection to Libera.Chat using HexChat and start using the Ubuntu IRC channels?
Libera.Chat provide a guide at https://libera.chat/guides/hexchat
Note: on my Lubuntu impish system I could not skip from step 2 to 5; but that could be because my system is old (many-many-release-upgrades)