





Needed for sharing files between main profile, private space or work profile. Also useful for bad apps that don't allow exporting files normally.











Unofficial open source app for real-time emergency alerts, supporting over 270 CAP alert feeds worldwide, written in Flutter, and free of ads.



Music player for android, in accordance with author's vision of how a music player should look like.






KeePassDX is a material design KeePass client for managing keys and passwords in an encrypted database for your Android device.










works offline but full of ads. needed to "sign" PDFs (Add an image), fill forms etc. Files can be shared to "SaveLocally" to avoid the locked "export" feature




Identify bird sounds in real time with this Android version of BirdNET. Bird sound recognition for more than 6,000 species worldwide.



very secure but not very private. good for progressive webapps (PWAs) you can place on the screen. This avoids installing apps which have way more access over private information








SoundAura is an open source ambient sound app. It does not include any audio tracks to save on download size, but allows users to add local files from their device and play any (reasonable) number of them concurrently, with individual volume controls for each track.







SherpaTTS is an Android Text-to-Speech engine based on Next-gen Kaldi using Piper or Coqui voices.





The app is free on F-Droid and on GitHub but you can buy it on the Google Play Store to support the developer.



Sync your contacts offline to a folder, which is synced with Syncthing. Runs in the background and just works

PGP for Android. Not only useful for email end-to-end encryption, but also for using "encrypted inbox" which some providers like mailbox.org offer



Öffi is an Android app that tells you where and when trains and buses go, including delays and replacement bus services for more and more transport authorities in Europe and worldwide.




Get apps directly from source. Only from trusted developers! Useful for apps that are not released on F-Droid.



Mullvad is a VPN service that helps keep your online activity, identity, and location private.




Monerujo is the first app for managing and using Monero wallets on Android. It is a lightwallet: it uses remote nodes for synchronizing to the Monero blockchain while keeping all your private data on your device.



Signal but better. Combine with MollySocket and a unifiedPush distributor like "Sunup" to save batterylife without Google tracking



Markor is a TextEditor for Android, versatile, flexible, and lightweight. Markor utilizes simple markup formats like Markdown and todo.txt for note-taking and list management. It is versatile at working with text; it can also be used for keeping bookmarks, copying to clipboard...



The official Syncthing App is not maintained anymore. Works really well to synchronize files between devices, no cloud needed



Send files over LAN. Also works if you connect to another phone via hotspot, then it is very fast.







LibreTorrent is a Free as in Freedom torrent client for Android 4 and later, based on libtorrent. Download and share files directly on your device.


Introducing Fossify Contacts - the next evolution in contact management. Poised to redefine how you manage your contacts, our app combines simplicity with advanced features, tailored for both personal and professional use.



Breezy Weather is a weather app with a strong focus on design, with a simple, clean UX, smooth animations, and Material Design all over, plus lots of customizability.






Facilitates device communication, enabling notifications, SMS replies, file sharing, and remote control across multiple operating systems.











Your privacy-aware, open-source calendar with intuitive design and multi-platform syncing.



Jerboa is an app for Lemmy, a federated reddit alternative. Jerboa is made by Lemmy's developers, and is free, open-source software, meaning no advertising, monetizing, or venture capital, ever.


IronFox is a fork of DivestOS's Mull Browser based on Firefox. Our goal is to continue the legacy of Mull to provide a secure, hardened and privacy-oriented browser for daily use.



Image toolbox is the app which based on modern tech stack using Clean Architecture. It has features like filters applying, cropping, EXIF editing, quality and output image type picking and tons of another options.




Multi-streaming client for desktop and mobile supporting YouTube, Twitch, other services, universal feed, live chat, playlist import, and offline playback.




A free and cloudless replacement for your gadget vendors' closed source Android applications. Supports Pebble, Mi Band, Liveview, HPlus and more.



he Flora Incognita App enables you to identify plants automatically quickly, easily and accurately .



FitoTrack is a mobile app for logging and viewing your workouts. Whether you’re running, cycling or hiking, FitoTrack will show you the most important information, with detailed charts and statistics. It is open-source and completely ad-free.






Feeder is a fully free/libre feed reader. It supports all common feed formats, including JSONFeed. It doesn't track you. It doesn't require any setup. It doesn't even need you to create an account!



Comments
I'd like to add DekuSMS and CopySMScode