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cool-retro-term: terminal emulator which mimics the look and feel of the old cathode tube screens
(github.com)
available via homebrew with:
brew install --cask cool-retro-term
according to the github, most distributions such as Ubuntu, Fedora or Arch already have the package cool-retro-term in their official repositories
I use it a lot. It's very good at emulating the screen I used on a VT220 for a long time. Has all kinds of effects settings, too.