I don't have the name handy, but there's at least one plugin for vim that shows buffer previews in a popup. I've got it mapped to leader-sb (for "show buffer").
You can see all registers in use with :registers, to paste from a register say "2 in insert mode use key combination <ctrl-r>2 or in normal mode "2p. You can check out more in :help registers. Unnamed register or "" is the system clipboard I think. To copy texts in a register you can prepend yank (/delete/cut, etc.) with that register "_ (for black hole register[^black_hole])
This is for neovim. Have keybinds for them and there saved you a plugin :D
[^black_hole]: Text yanked in this register is gone, i.e. it's not saved in any register.
So far I haven't been brave enough for that feature. It's either "that main place yank goes", "system clipboard", or "that place that makes it disappear" for me