This one is simple but pretty advanced, I started using daily one year ago and I have to say that I love it.
Worth mentioning :
Simple Money Tracker
Paisa
Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- F-Droid
The ultimate F-Droid setup (300+ Apps)
Productivity PART XII - Finance
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- F-Droid
If you invest your money take a look at this one !
For real time stock market watcher :
Candle (cosmos)
+2
Productivity PART XIII - Office
NOT ON THE OFFICIAL REPO ! Collabora official F-Droid repo
A FLOSS
Microsoft 365 Copilot alternativeCost / License
- Freemium
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Chrome OS
- Android Tablet
- iPad
- Self-Hosted
- Software as a Service (SaaS)
- Cloudron
- Flathub
- Flatpak
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
Productivity PART XV - RSS Feed
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!
Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- Android Tablet
- F-Droid
Cost / License
- Free
- Open Source
Platforms
- Android
- iPhone
- Android Tablet
- iPad
- F-Droid
Adaptive offline RSS reader for Android with modern material design, privacy-first approach, theming, import/export, and resource-light operation. No data leaves device.
Productivity PART XV - Miscellaneous
Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- F-Droid
Cost / License
- Freemium
- Open Source
Application types
Platforms
- Windows
- Linux
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
- Google Chrome
- Cloudron
- Opera
- Mozilla Firefox
+4
The LibreOffice Impress Remote is an app to interact with your slideshow presentation from your Android device - including slide previews, speaker notes, and more.
Cost / License
- Free
- Open Source
Platforms
- Android
- iPhone
- Android Tablet
- iPad
- LibreOffice
Privacy PART I - Keyboard
The most nerd friendly !
Support gestures typing like
Gboard or 
Microsoft SwiftKey. Not as good tho...
+8
Privacy PART II - Firewall
Cost / License
- Freemium
- Open Source
Application types
Platforms
- Android
- Android Tablet
- F-Droid
If you're a nerd go with Blokada (4), if you are a casual user or just want simplicity go with Blokada 5.
Worth mentioning :
DNS66
RethinkDNS I like this one
Proxy app for android that root your traffic through the Tor network Can act like a VPN for whitelisted apps.
Cost / License
- Free
- Open Source
Application types
Platforms
- Mac
- Android
- iPhone
- Android Tablet
- iPad
Privacy PART III - VPN
VPN are not as perfect as they often are claiming too. Almost every VPN provider is "lying" a way or another. It's called marketing and their is tons of sh*tty VPN on the https://alternativeto.net/software/android-market/ that are here to makes money on you and stealing your data. Keep in mind that using a VPN is basically giving all your internet traffic to another private company that often don't even owns their servers. Sometimes they are under several legislations.
DO YOUR OWN RESEARCH INSTEAD OF CHOOSING A VPN BASED ON THIS LIST ! I'VE JUST MENTION WHAT ARE IN MY OPINION (which is worthless) THE BEST VPNs AVAILABLE ON F-DROID !
You can use this as a FOSS VPN client to connect to your VPN provider. (If it support it, if not it is probably a bad provider)
Cost / License
- Freemium
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Android Tablet
- iPad
- Self-Hosted
- Cloudron
You can use this as a FOSS VPN client to connect to your VPN provider. (If it support it) It's a newer and faster VPN protocol
Cost / License
- Free
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- BSD
- iPad
- Self-Hosted
- FreeBSD
- OpenWrt
- Termux
+1
ProtonVPN is brought to you by the team of scientists from CERN and MIT that developed
Proton Mail . Their 1'500+ servers are in 61 countries.
Their marketing is not as misleading as others mainstream VPNs
They are incorporated in Switzerland (pretty strong privacy laws) and claims to keep no logs of your online activity.
They also have a free tier with limited functionalities and speed but does not track their users like many free VPNs.
You can pay with 
BitcoinCost / License
- Freemium
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Chrome OS
- Android Tablet
- iPad
- Google Chrome
- Apple TV
- Flathub
- F-Droid
- Android TV
- Flatpak
- Fire TV
- Mozilla Firefox
+6
I really like the marketing of this VPN as it is not misleading unlike to others that claims to gives you strong anonymity and perfect privacy in one click while protecting you from NSA and hackers. Their 750+ servers are in 38 countries.
They are privacy focused and not expensive. You don't even needs to give any personnal info to use their tool and you can pay by cash or with
Bitcoin .
Mozilla VPN is in fact 
Mullvad with Mozilla branding.Cost / License
- Paid
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Chrome OS
- Android Tablet
- iPad
- F-Droid
- WireGuard
- Tor
- OpenWrt
- Tomato
- pfSense
- DD-WRT
+10
This one is also having a marketing similar to
Mullvad and are also privacy focused. They also don't need e-mail to generate an account.
Their 100+ servers are in 32 countries.
Speed might not be as good as Mullvad and 
Proton VPN but security and privacy is really strong !Cost / License
- Paid
- Open Source
Application types
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Android Tablet
- Windows Phone
- iPad
- F-Droid
- WireGuard
- OPNsense
- OpenWrt
- Tomato
- pfSense
- OpenVPN
- DD-WRT
- Snapcraft
Privacy PART IV - Crypto
THIS IS NOT FINANCIAL ADVICE !
If you want to learn more on how to buy, store and use crypto the right way to empower your sovereignty and/or privacy look at my other list Doing crypto the right way !
NOT ON THE OFFICIAL REPO ! Samourai Wallet F-Droid repo
Bitcoin walletIs probably the most secure and privacy friendly BTC wallet for Android (and any mobile OS, better than most desktop options too). Really strong privacy and anonymity out of the box. Be your own Swiss Bank as they says. You can CoinJoin so it mixes your coins using the Whirlpool and makes the outputs anonymous.
NOT ON THE OFFICIAL REPO ! Official Monerujo F-Droid repo
Monero wallet really featureful, community driven and easy to use.Is mention on the official Monero website !
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
NOT ON THE OFFICIAL REPO ! Official SBP repo An open source app to easily accept
Bitcoin and LN in your commerce with little to no fees in a self-custody way (funds are custody by SBP for 24h before a free automatic withdraw)Cost / License
- Free
- Open Source
Application types
Platforms
- Android
- iPhone
- Android Tablet
- iPad
- F-Droid
- Software as a Service (SaaS)
+2
Cost / License
- Free
- Open Source
Platforms
- Android
- iPhone
- Web Browser
- F-Droid
Privacy PART V - Miscellaneous
NOT ON THE OFFICIAL REPO ! IzzyOnDroid repo
Let you monitor the trackers and logger that are inside the apps that are installed on your phones in a beautiful way.
Worth mentioning :
Exodus Privacy (Which Warden rely on) less beautiful but has more complete informations ! (official repo)
ClassyShark3xodus Even more warnings and specs ! (official repo)Cost / License
- Free
- Open Source
Platforms
- Android
Scrambled Exif (pronounced eggsif) helps you remove the metadata in your pictures before you share them. To remove the metadata from a picture, simply share it like you'd normally do and choose Scrambled Exif. A moment later, the share 'dialog' will reappear. Now just share with the app you intended to share with in the first place. Et voilà!
Worth mentioning :
Exif Eraser More modern IzzyOn Droid repo
ImagePipeCost / License
- Free
- Open Source
Platforms
- Android
- Android Tablet
- F-Droid
Shelter lets you create a Work Profile to compartimentilize your apps so they can't access contacts or any other information in your Main Profile.
Supports advanced features. The PlayStore version is currently outdated and does not support Android 12+
Cost / License
- Free
- Open Source
Application type
Platforms
- Android
- Android Tablet
- F-Droid
NOT ON THE OFFICIAL REPO ! Nebulo official F-Droid repo
If you are using an old Android version and want to change to a custom DNS Nebulo is my go to. DNS recommendation : https://www.quad9.net/ (9.9.9.9)
THIS FEATURES IS IN ANDROID 12 AND CALYXOS !!!
Know when a third party app is using your microphone and/or camera !
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
THIS FEATURES IS IN ANDROID 12 AND CALYXOS !!!
Know when a third party app is using your microphone and/or camera !
Cost / License
- Free
- Open Source
Platforms
- Android
An app that allows you to fake/spoof your GPS location by mocking it.
Does not use any GoogleMaps API, code or whatever, really privacy friendly !
Worth mentioning :
Fake TravelerCost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
Apple finally did an official app but this one is open source ! Protect yourself from being tracked 🌍 by AirTags 🏷 and Find My accessories
With AirGuard you get the anti-tracking protection you deserve! The app periodically scans your surroundings for potential tracking devices, like AirTags or other Find My devices. The AirTags and other Find My devices are simple, small and perfect to track Android users! Without tracking warnings, as integrated on iOS, anyone could try to track your behavior by placing an AirTag in your jacket, backpack or car.
Cost / License
- Free
- Open Source
Platforms
- Android
- F-Droid
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