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Here are some useful applications. Feel free to add your own suggestions:

Aegis.

Aegis Authenticator is a free, secure and open source app for Android to manage your 2-step verification tokens for your online services.

AntennaPod

AntennaPod is a podcast player that is completely open. The app is open-source and you can subscribe to any RSS feed. AntennaPod is built by volunteers without commercial interest, so it respects your privacy while giving you full control.

Simple Calendar Pro

A simple calendar with events, tasks, customizable colors, widgets and no ads.

Catima

A Loyalty Card & Ticket Manager for Android

Simple Contacts Pro

Easy and quick contact management with no ads, handles groups and favorites too.

DAVx5

Sync your contacts, calendars and tasks. Get live-access to your WebDAV Cloud files. All-in-one CalDAV/CardDAV/WebDAV solution for Android

FairEmail

Fully featured, privacy oriented email app for Android

Florisboard

An open-source keyboard for Android which respects your privacy. Currently in early-beta.

Simple Gallery Pro

A premium app for managing and editing your photos, videos, GIFs without ads

Loop Habits Tracker

Loop Habit Tracker, a mobile app for creating and maintaining long-term positive habits

KDE Connect

Enabling communication between all your devices. Made for people like you.

OpenKeyChain

OpenKeychain helps you communicate more privately and securely.

Organic Maps

Organic Maps is a free Android & iOS offline maps app for travelers, tourists, hikers, and cyclists based on top of crowd-sourced OpenStreetMap data.

RHVoice

RHVoice is a free and open-source multilingual speech synthesizer.

RunnerUp

A open source run tracker

Vynil

A material designed music player for Android

Voice

Minimalistic audiobook player

Geometric Weather

A Material Design Weather Application

And of course, Open source lightning wallets with on-chain support

The combo of DAVx5 and Nextcloud is ridiculously powerful. My calendars, contacts, notes, and tasks (eg, grocery checklists) are all synced to my nextcloud instance and seamlessly work in place of Google-owned services

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Yes, it's basically most of the things you need.

CalDAV for Calendar and events, CardDAV for contacts, and WebDAV for files. All in your own server. DAVx5 gives you all of them.

Basically what Google and other big tech companies offer you, but you have full control of this.

If you want something simpler than Nextcloud, Radicale is a great simple Free and Open-Source CalDAV and CardDAV Server

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Or just use a StartOS node and let it be orchestrated nicely! 😁

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https://en.wikipedia.org/wiki/StartOS

StartOS (formerly Ylmf OS) is a discontinued Chinese Linux distribution

That one?

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What? Not at all! 😂 I wouldn't trust Wikipedia for a second...

https://github.com/Start9Labs/start-os (and it's now MIT open source licensed!)

https://start9.com/ (if you're interested in looking at their devices - I think they're currently sold out but you can get more info in their TG channel if you're curious)

Simplex Chat for messaging!

https://github.com/simplex-chat/simplex-chat

also Robosats for kyc free corn

https://github.com/RoboSats/robosats

and Amethyst for nostr

https://github.com/vitorpamplona/amethyst

Protonmail if you use them for email: https://github.com/ProtonMail/proton-mail-android

element for company / organisation comms using matrix protocol

https://github.com/vector-im/element-android

VLC for media (kudos for not using Microsoft github):
https://code.videolan.org/videolan/vlc-android

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Nice additions, thanks!

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Very good list with github links!
To gather all of them and be alerted for updates, use Obtainium (also OSS)
https://github.com/ImranR98/Obtainium

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Yeah, that seems nice. I still prefer to do a manual update, but seems cool.

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My two cents

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Great list! And of course the stacker.news pwa :-)

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Solid list.

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Nice list, I will suggest few additions:

Keyboard: OpenBoard (FOSS, no internet connection), auto-fill and suggestions working fine, only missing the glide typing, not implemented, not sure if they ever will. For me, hard to choose, I swap between both, but the corrector and the suggestions in some occasions can make your typing more efficient. Hopefully Florisboard will implement properly the suggestion and autocorrect soon. BTW, the gliding feature in Florisboard only work in English at the moment, which is a pity. You can find it in F-Droid.

Map: "Organic Maps" is great, although, IMO, there is not an app I have tested better than "Magic Earth", FOSS and available in F-Droid, as good as Waze with offline maps if needed. Available as well in F-Droid

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Magic Earth is not open source, and it's also not in f-droid.

Do you have a link to the source code?

Also, it's only available from App Stores, no apk available.

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It has been a while since I check, was surprised by your reply, went to check and you are right, not opensource, based on Openstreetmaps... Oh well..., time to do some research and reconsider, not in F-Droid neither and you well stated. Thanks for keeping me straight, highly appreciate it!

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And you can find every app on this list on https://f-droid.org and https://apt.izzysoft.de/fdroid/ repo

I would recommend every app on fdroid well, as all apps are open source.

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The lightning wallets are not in f-droid though.

And sometimes there are different versions available in there vs the git repo, specially FairEmail

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Join me on Athena network to create a group for mining.

https://athene.network/

https://m.stacker.news/19534

Nice list!

I would also add Librera Reader for ebooks

InviZible Pro for i2p, tor and dnscrypt

And Scrambled Exif for deleting metadata from photos.

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Nice.

I also quite like Book Reader, specially their handling of text in PDFs is fantastic (it makes text readable automatically, instead of having to zoom in)

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Another app that I think is great is openScale.

Open-source weight and body metrics tracker, with support for Bluetooth scales

You can also use it inputting your weight manually, so a Bluetooth scale is not a requirement.

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Great list. A few more I personally enjoy using:

  • OpenTracks, a privacy-preserving sports tracker (to pair with OSMDashboard to view your running sessions on maps (from OSM).
  • Trail-Sense for when you go hiking (features a lot of tools).
  • ViMusic to stream music from YouTube Music for free, and with one of the best UI I've seen in music players.
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Nice additions, thanks.

OpenTracks support of non-GPS activities caught my attention, since RunnerUp always requires GPS.

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