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FOSS apps for a trip
(lemmy.world)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
Cirrus for weather, Currencies for, well, currency conversion, LavSeeker for searching public toilets.
All are available on F-Droid.