apebar is bar framework for macOS which is built on top of Übersicht.
git clone https://github.com/kinglouie/apebar.git $HOME/Library/Application\ Support/Übersicht/widgets/apebar
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Some of the widgets depend on additional binaries which are not shipped with apebar. The easiest way to install them is the macOS package manager homebrew.
brew install ifstat
This widget will only work if you're using chunkwm (tiling window manager)
brew tap crisidev/homebrew-chunkwm
brew install chunkwm