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Chip Defense. A little FOSS tower defense game.
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KDE Connect. Tool to transfer files to another device, or vice versa.
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Trail Sense. Nice lightweight app that does a variety of things, but I mostly use it for white noise.
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Organic Maps. I try to use it instead of Google Maps whenever possible.
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FitoTrack. Amazing app to keep logs of your workouts, or motorcycling trips as I use it. Shows you where you went, how fast you want, and how many calories burned where applicable.
Edit: Tried to count down from 5 to 1 as this is my top 5 apps from F-droid, but the auto bullet thing is counting up instead