OsmAnd
F-Droid
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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I'm very fond of breezy weather which is on f-droid.
Seconded, breezy weather is amazing. I've installed it from source with obtainium.
WhoBird
AntennaPod for podcast travels
InnerTune in the same vein as Antenna pod
Organic Maps. Make sure you download the areas beforehand. The resolution for walking paths is much nicer, and you can clearly see the routes of temples and other points of interest.
It also shows data about drinking faucets, toilets, and other things provided by users.
Cirrus for weather, Currencies for, well, currency conversion, LavSeeker for searching public toilets.
All are available on F-Droid.
Green Pass PDF Wallet! This app is super nice for storing/viewing boarding passes and other important documents while travelling. Has nice features such as automatically turning up the display brightness when viewing a file, so that the QR/Barcodes are more easily scannable.
I usually put all the relevant travel data in my Joplin notebook. If the tickets are availible as .passkey files I manage them with PassAndroid. Transportr for public transportation. Wireguard if you need to access your home network via VPN.
Thanks I just tried PassAndroid, pretty slick! I was using KDE Itinerary (way more features and always improving, but not too polished yet) to manage tickets before, now I have an alternative.
Regarding wireguard I always used WG Tunnel from f-droid, I'm looking at the official Wireguard app screenshots and it seems to have the same functionality (easy config import via QR scan, notification shade button), maybe it looks prettier. Not on f-droid, that's why I didn't come across it before.
Nothing wrong with WG Tunnel. Btw Wireguard is on the IzzyOnDroid Repo.
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.
Scan your passport.
For currency conversion as well as other cinversions: https://f-droid.org/packages/com.physphil.android.unitconverterultimate/