catgirl it's a very obscure terminal one but it has all the features I need, though I sometimes switch to the classic irssi, I used to use thelounge for a little bit but web based chat applications aren't my thing.
I used to use Weechat in a screen instance on my home server to keep persistence but I moved to Convos.chat and it's pretty nice. The client runs on your server, you interact with that via your browser. The webapp has some nice features like the ability to host files for sharing with other users, inline link previews and searches.