I rarely open a terminal without tmux (a terminal multiplexer like 'screen'). From there I run htop, vimwiki (for documentation), and various other utilities as needed.
copyq (already mentioned) helps a lot with terminal/app copy paste as well.
tmux is fantastic. I've slowly stopped using it as I utilize i3 and VIM more heavily.
But I'd like to get back into it. It's sooooo good.
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