[PhilipRoman]

One program that does copying right IMO is tmux, it keeps a list of recently copied things, which you can view by pressing Ctrl-B = and choose which clipboard to paste.

Very useful when you need to copy multiple separate strings without going back and forth between windows. I've caught myself doing optimistic copying - if I see something that i might need to paste in the future, like git commit hashes, file names, etc. I just copy them all and store them in the clipboard list.

I think there is a program "clipmenu" which does this for X11, but haven't used it too much.

[pawelduda]

This is my must have extension. Gnome has one and there's an app for that on MacOS. Multiple clipboard entries are such a trivial but useful change that I can't go back to the old way anymore

[taskforcegemini]

notepad++ has this feature, and I think current windows versions do as well