[General Topics] lm8lm8:
List of Android apps I recommend

(at the end of document, the list with URL/links added, towards the specified application store)

[*] maps.me (playstore), organicmaps (playstore, fdroid) : offline navigation/maps, uses OSM, instead of google.

[*] aurora-store (fdroid): alternative app/client of playstore

[*] fdroid (via fdroid.org) : alternative application store to the playstore, containing various opensource apps, mainly non-playstore-available apps.

[*] cachecleaner (fdroid) : permits to wipe/remove/erase cache of all android's apps in one time (not data, only cache) via automatism ; takes 10 to 15 mins, for hundred apps.

[*] carnet (playstore, fdroid): notepad app with two nice features : PIN access code lock, backup/sync via webdav/nextcloud

[*] conversations/quicksy (playstore, fdroid) : secured messenging app (xmpp client) for android, uncentralized, federated. Conversations requires a/several account (like for email client), instead of quicksy, using only and directly user's phone number) ; both made by same dev.

[*] davx (playstore, fdroid): add caldav calendars to android

[*] elements (playstore, fdroid): matrix secured messenging client

[*] fairemail (playstore, fdroid) : free email client (via fdroid)

[*] feeder (playstore, fdroid): reader/agregator of RSS feeds, to unify all incoming news from various medias, to a single place

[*] fennec (fdroid) : firefox's fork, available on fdroid

[*] simple file manager pro (fdroid) : file explorer

[*] foldersync (playstore) : allow to do synchronization to/from different cloud/storage places

[*] simple gallery pro (fdroid): photos/pictures gallery viewer

[*] gpstest (playstore): allow to check the compatibility of the device with different GNSS (global navigation satellite system), eg galileo (european's one) or others : GPS, GLONASS, GALILEO, SBAS, BEIDOU and QZSS

[*] k9mail (playstore, fdroid): email client

[*] koreader, mupdfviewer, liberiafd, bookreader (few on playstore, all:fdroid): pdf reader, epub viewers..

[*] libretube, skytube, newpipe (meilleur), pipepipe (tous:fdroid): alternative youtube's clients, to avoid advertising/advertisement.

[*] linphone (playstore,fdroid): sip client, permits to communicate for free/unlimited through the internet, with others sip users : messages, video, audio. french initiative.

[*] lower brightness (playstore) : customize/low brightness, beyond android's system limits

[*] muzei (playstore, addons via fdroid): alternative to the wallpapers google's app ; a new wallpaper per day, regarding wallpaper's source (fdroid) : national geographic, etc)

[*] nextcloud (playstore, fdroid): sync client app for nextcoud usage & server

[*] notally (fdroid): alternative notepad app

[*] opentracks (fdroid): GPS tracker focused on privacy (bike, etc..)

[*] pilldroid (fdroid): identifie medicine/pills products, regarding barcode (only for FR-listed medicine registred products)

[*] qksms (playstore,fdroid): alternative SMS management app, allows backups.

[*] redmoon (fdroid): creates a red/orange screen filter, to diminue impact of blue light.

[*] stellarium (playstore) : opensource planetarium, beloved by space amateurs. Free and premium versions

[*] VLC : multimedia player (playstore, fdroid)

[*] Yet Another Call Blocker (fdroid): allow to block unsollicited incoming calls, either using a community list/source (signaled from internet users), or by single, or several/range of phone numbers blocking system

All fdroid application are generally free and opensource, no payment will be asked (normally) ; a warning is shown on every app requiring some specific/sensitive data (geolocation, phone number..)

[*] proton services (https://proton.me), mail, vpn, drive (commercial organization) are not included, even if they have good, or less good, practical features.

[*] various alternative/third-app messenging apps are not listed, they are too many (session, briar, dib2qm, tox, simplex, deltachat, trifa, and many others) see :

overview of all secured-orless messaging apps....

I see sometimes newspaper from general way or even IT-specialised journalists comparing few secure messenging apps, without bringing advanced or expert eyes on that. So Im wondering, about firstly a long list of tools about secured messenging and...

forum.xda-developers.com

first list, with URL/Links :

[*] maps.me (playstore), organicmaps (playstore, fdroid) : offline navigation/maps, uses OSM, instead of google.

MAPS.ME: Offline maps GPS Nav - Apps on Google Play

Worldwide offline navigation with maps and driving directions

play.google.com

Organic Maps: Offline Maps - Apps on Google Play

Navigate with Privacy - Community-Driven & Open-Source

play.google.com

Organic Maps : Rando Vélo Auto GPS Offline | F-Droid - Free and Open Source Android App Repository

Naviguer en toute intimité - Initiative communautaire en source ouverte

f-droid.org

[*] aurora-store (fdroid): alternative app/client of playstore

Aurora Store | F-Droid - Free and Open Source Android App Repository

An unofficial FOSS client to Google Play with an elegant design and privacy

f-droid.org

[*] fdroid (via fdroid.org) : alternative application store to the playstore, containing various opensource apps, mainly non-playstore-available apps.

F-Droid - Free and Open Source Android App Repository

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.

fdroid.org

[*] cachecleaner (fdroid) : permits to wipe/remove/erase cache of all android's apps in one time (not data, only cache) via automatism ; takes 10 to 15 mins, for hundred apps.

Cache Cleaner | F-Droid - Free and Open Source Android App Repository

Clean cache of installed user and system apps using Accessibility

f-droid.org

[*] carnet (playstore, fdroid): notepad app with two nice features : PIN access code lock, backup/sync via webdav/nextcloud

Carnet - Notes app - Apps on Google Play

Powerful note taking app with sync and online editor

play.google.com

Carnet | F-Droid - Free and Open Source Android App Repository

Application de prise de note avec synchronisation et éditeur en ligne

f-droid.org

[*] conversations/quicksy (playstore, fdroid) : secured messenging app (xmpp client) for android, uncentralized, federated. Conversations requires a/several account (like for email client), instead of quicksy, using only and directly user's phone number) ; both made by same dev.

Conversations (Jabber / XMPP) - Apps on Google Play

An encrypted, user friendly XMPP instant messaging client optimized for mobile

play.google.com

Conversations | F-Droid - Free and Open Source Android App Repository

Messagerie instantanée XMPP chiffrée et facile avec votre appareil mobile

f-droid.org

Quicksy - Apps on Google Play

An XMPP client with Easy Entry and Easy Discovery

play.google.com

Quicksy | F-Droid - Free and Open Source Android App Repository

Jabber/XMPP simple d'accès, avec découverte facile des contacts

f-droid.org

[*] davx (playstore, fdroid): add caldav calendars to android

DAVx⁵ – CalDAV CardDAV WebDAV - Apps on Google Play

Sync Contacts (CardDAV), Calendars and Tasks (CalDAV). Access your WebDAV files.

play.google.com

DAVx⁵ | F-Droid - Free and Open Source Android App Repository

Synchronisation et client CalDAV / CardDAV

f-droid.org

[*] elements (playstore, fdroid): matrix secured messenging client

Element - Secure Messenger - Apps on Google Play

Group messenger - encrypted messaging, group chat and video calls

play.google.com

Element - Messagerie sécurisée | F-Droid - Free and Open Source Android App Repository

Messagerie de groupe - messages chiffrés, groupes et appels vidéos

f-droid.org

[*] fairemail (playstore, fdroid) : free email client (via fdroid)

FairEmail, privacy aware email - Apps on Google Play

Fully featured, privacy oriented email app

play.google.com

FairEmail | F-Droid - Free and Open Source Android App Repository

Client de courriel complet. Net et conviviale. Favorise la confidentialité

f-droid.org

[*] feeder (playstore, fdroid): reader/agregator of RSS feeds, to unify all incoming news from various medias, to a single place

Feeder - Apps on Google Play

An awesome Libre and Open Source RSS feed reader

play.google.com

Feeder | F-Droid - Free and Open Source Android App Repository

Un super lecteur de flux RSS libre et gratuit

f-droid.org

[*] fennec (fdroid) : firefox's fork, available on fdroid

Fennec F-Droid | F-Droid - Free and Open Source Android App Repository

Browse the web

f-droid.org

[*] simple file manager pro (fdroid) : file explorer

Simple File Manager Pro | F-Droid - Free and Open Source Android App Repository

Explorez, compressez, transférez convertissez fichiers multimédias optimisez

f-droid.org

[*] foldersync (playstore) : allow to do synchronization to/from different cloud/storage places

FolderSync - Apps on Google Play

FolderSync enables easy sync of files between cloud storage and Android devices.

play.google.com

[*] simple gallery pro (fdroid): photos/pictures gallery viewer

Simple Gallery Pro | F-Droid - Free and Open Source Android App Repository

Une galerie pour voir des photos et vidéos sans publicité et modifier des photos

f-droid.org

[*] gpstest (playstore): allow to check the compatibility of the device with different GNSS (global navigation satellite system), eg galileo (european's one) or others : GPS, GLONASS, GALILEO, SBAS, BEIDOU and QZSS

GPSTest - Apps on Google Play

The open-source GNSS/GPS app on Android

play.google.com

GPSTest | F-Droid - Free and Open Source Android App Repository

Une application pour tester les capacités GPS et GNSS d'un appareil

f-droid.org

[*] k9mail (playstore, fdroid): email client

K-9 Mail - Apps on Google Play

K-9 Mail is a 100% free and open source email client for Android.

play.google.com

Courriel K-9 Mail | F-Droid - Free and Open Source Android App Repository

Client de courriel complet

f-droid.org

[*] koreader, mupdfviewer, liberiafd, bookreader (few on playstore, all:fdroid): pdf reader, epub viewers..

koreader : https://f-droid.org/fr/packages/org.koreader.launcher.fdroid

mupdfviewer: https://play.google.com/store/apps/details?id=com.artifex.mupdf.viewer.app

mupdfviewer: https://f-droid.org/fr/packages/com.artifex.mupdf.viewer.app

librera : https://play.google.com/store/apps/details?id=com.foobnix.pdf.reader

librera : https://f-droid.org/fr/packages/com.foobnix.pro.pdf.reader

bookreader : https://play.google.com/store/apps/details?id=com.github.axet.bookreader

bookreader : https://f-droid.org/fr/packages/com.github.axet.bookreader

[*] libretube, skytube, newpipe (meilleur), pipepipe (tous:fdroid): alternative youtube's clients, to avoid advertising/advertisement.

libretube : https://f-droid.org/en/packages/com.github.libretube/

skytube : https://f-droid.org/fr/packages/free.rm.skytube.oss

newpipe : https://f-droid.org/packages/org.schabi.newpipe/

pipepipe : https://f-droid.org/packages/org.schabi.newpipe/

[*] linphone (playstore,fdroid): sip client, permits to communicate for free/unlimited through the internet, with others sip users : messages, video, audio. french initiative.

Linphone - Apps on Google Play

Linphone is an open source internet SIP phone or Voice Over IP phone (VoIP).

play.google.com

Linphone - open source SIP client | F-Droid - Free and Open Source Android App Repository

Téléphone SIP (VOIP)

f-droid.org

[*] lower brightness (playstore) : customize/low brightness, beyond android's system limits

Lower Brightness Screen Filter - Apps on Google Play

"Lower Brightness" can reduce screen brightness below system minimum brightness

play.google.com

Dimmer | F-Droid - Free and Open Source Android App Repository

Réduire la luminosité

f-droid.org

[*] muzei (playstore, addons via fdroid): alternative to the wallpapers google's app ; a new wallpaper per day, regarding wallpaper's source (fdroid) : national geographic, etc)

Muzei Live Wallpaper - Apps on Google Play

A living museum for your Android home screen.

play.google.com

National Geographic for Muzei | F-Droid - Free and Open Source Android App Repository

Photos du National Geographic pour l'appli Muzei

f-droid.org

[*] nextcloud (playstore, fdroid): sync client app for nextcoud usage & server

Nextcloud - Apps on Google Play

The Nextcloud Android app allows you to access all your files on your Nextcloud.

play.google.com

Nextcloud | F-Droid - Free and Open Source Android App Repository

Client de synchronisation

f-droid.org

[*] notally (fdroid): alternative notepad app

Notally - Minimalist Notes - Apps on Google Play

A simple and elegant open source notes app

play.google.com

Notally | Notes Minimalistes | F-Droid - Free and Open Source Android App Repository

Une application de notes open-source, simple et élégante.

f-droid.org

[*] opentracks (fdroid): GPS tracker focused on privacy (bike, etc..)

OpenTracks | F-Droid - Free and Open Source Android App Repository

Appli de suivi des activités sportives respectueuse de votre vie privée.

f-droid.org

[*] pilldroid (fdroid): identifie medicine/pills products, regarding barcode (only for FR-listed medicine registred products)

Pilldroid | F-Droid - Free and Open Source Android App Repository

Pilldroid est un gestionnaire théorique de stock de médicaments.

f-droid.org

[*] qksms (playstore,fdroid): alternative SMS management app, allows backups.

QKSMS - Apps on Google Play

Love texting again. The most beautiful messaging app for Android.

play.google.com

QKSMS | F-Droid - Free and Open Source Android App Repository

Appli de messagerie

f-droid.org

[*] redmoon (fdroid): creates a red/orange screen filter, to diminue impact of blue light.

Red Moon | F-Droid - Free and Open Source Android App Repository

Filtrer la lumière bleue de votre écran pour un meilleur sommeil

f-droid.org

[*] stellarium (playstore) : opensource planetarium, beloved by space amateurs. Free and premium versions

Stellarium Mobile - Star Map - Apps on Google Play

A realistic sky map to observe stars, planets, satellites and constellations!

play.google.com

[*] VLC : multimedia player (playstore, fdroid)

VLC for Android - Apps on Google Play

VLC for Android is the best open source video and music player, fast and easy!

play.google.com

VLC | F-Droid - Free and Open Source Android App Repository

Le meilleur lecteur vidéo et de musique open source, rapide et facile d'emploi

f-droid.org

[*] Yet Another Call Blocker (fdroid): allow to block unsollicited incoming calls, either using a community list/source (signaled from internet users), or by single, or several/range of phone numbers blocking system

Yet Another Call Blocker | F-Droid - Free and Open Source Android App Repository

Block unwanted calls effortlessly

f-droid.org