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I am a huge fan of Spotlight, Raycast, Albert, etc.
But they all have some kind of problem, like not being on that platform, or being proprietary, or being a nightmare to modify.
99% of the tools I use (calculator, dictionary) already exist on the command line, except they look ugly and are nowhere close to being "out of the box."
If one were to add good opening/hiding shortcuts, window size, suggestions, and a shell config to a terminal emulator it would be a perfect launcher app.
I know I am doing the typical "FOSS devs please do it for me" request, but I am considering doing it myself, unless someone already went down that rabbit hole before me.