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I try to always install with Homebrew. Because then you can uninstall with the --zap option, for example:

  $ brew uninstall --zap aerospace
Usually it blows away everything associated with the app, including cached files, configuration in ~/Library and ~/.config, etc. Very useful. It'll leave a non-functional login item which isn't active and can't be active.
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I like the app uninstaller included in Forklift. You open Applications folder, and delete an app. A window appears with all the associated files Forklift can find (which is extremely accurate, BTW), and you can uninstall everything you want from there.

For .pkg files, there's UninstallPKG which reads the package manifest and properly uninstalls it.

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I would like to take this moment to rage against Apple for shipping that package installer, literally 25 years ago, and never once having apparently even considered a native, out of the box way to uninstall programs that were installed that way.

Speaking of packages, even more embarrassing, Microsoft Windows literally beat them to shipping a first-party package manager. I feel like Apple lives in a fantasy land that the drag’n’drop app install method from the classic macOS is some kind of platonic ideal — never mind that they can’t stop half the apps out there from going outside that paradigm and installing their crap all over the place.

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I like the app ‘Lingon X’ I think is the name, to help with this. It’s a viewer/editor for all the startup and recurrent background tasks on your Mac. But also it has a feature to notify you of any edits/additions to the startup/background items that I otherwise wouldn’t have known about.
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I get notifications that an item has added itself to your login items.
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I do as well, but no app should be able to add itself to the login items: ask me or better have me navigate to the login items settings pane and add it manually.
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