Several months ago I switched from MacOS to Fedora.

Two things I really missed from MacOS that I thought didn't have a good alternative in Linux were Colloquy and Sequel Pro.

The Lounge via Docker Container and https://applicationize.me/ :

    docker run --detach \
            --name thelounge \
            --publish 9100:9000 \
            --volume ~/.config/thelounge:/home/lounge/data \
            --env THELOUNGE_HOME=/home/lounge/data \
            --restart always \
            -u "$(id -u $USER):$(id -g $USER)" \
            thelounge/lounge:latest

solved my IRC itch, and it works even better than Colloquy.

Still haven't found anything that comes close to Sequel Pro, though.