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Open-source social media is growing
(sopuli.xyz)
Cooperative community open-source fork of Organic Maps, an offline privacy-respecting not-for-profit OpenStreetMap GPS app for your phone.
Try Oeffi for public transport, it's awesome.
https://f-droid.org/packages/de.schildbach.oeffi
ahh unlucky for me. doesn't work in my region :(
Oh yeah, unlucky :(
There is also transportr and a couple of other apps on fdroid if you search for transport. Maybe you find something for your region.