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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.
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Handy to have an offline translation dictionary. I've used QuickDic for languages I know how to type, but I notice there are a bunch of more specialised Japanese dictionary apps in F-Droid that can search by radical or OCR if you don't type or understand the characters.