• Revanced Manager, a YouTube(+more!!!) patcher to remove, er, unwanted features.
• Bitwarden Password Manager, password manager I switched to when Lastpass went down the shitter and wanted me to pay. I even ended up paying 10/y for TOTP in bitwarden, but only because I fealt they actually deserved it, unlike lastpass
• Mull, A Firefox fork with privacy, free modifications, and extension support. Mozilla, Firefox, and the Gecko engine help to fight the Chromium monopoly, which powers browsers like Chrome, Edge, Opera, Vivaldi, etc.
• Termux, terminal emulator for Android. I really only use it in conjunction with Tasker (nonfree), but still useful for one-off applications
• K-9 Mail (soon Thunderbird for Android!), the only mail client for Android Ive ever used (apart from the gmail app). Now owned by Thunderbird and excited for it's future.
• Yuito, my preferred Mastodon client. I like it.

There are quite a few of them:

• Organic Maps - maps and navigation based on openstreetmap
• NekogramX - telegram client
• Element - client for matrix
• AntennaPod - for listening to podcasts
• OpenTracks - tracker for my cycling workouts
• AnySoftKeyboard - keyboard for android
• Joplin - note taking app
• F Droid - alternative to PlayMarket for FOSS applications
• LibreTube - FOSS client for YouTube with built-in proxy
• Fedilab - client for mastodon
• StreetComplete, EveryDoor - to improve openstreetmap
• Arna Translate - translator app based on the Lingva Translate API
• Termux - terminal app
• Spotube - client for Spotify without ads
• ~~Infinity for Reddit (RIP) - client for reddit~~

KeepassDX, newpipe, tusky, open board, Firefox, infinity(not for long sadly), jerboa, jellyfin, si gnal, f-droid, exodus, binary eye. All that on my phone. My computer runs fedora and I'm not changing anytime soon.

edit : forgot KDE connect on the phone as well.

• AntennaPod (podcast player)
• Authenticator Pro (2FA)
• Aves (gallery)
• Bitwarden
• Catima (for stores' reward cards)
• Etar (calendar)
• Geometric Weather
• Infinity for Reddit... as long as it works
• Joplin (note-taking software, synced with the desktop client)
• K-9 Mail
• Kvæsitso (launcher)
• Mull (Firefox fork)
• NetGuard (works in the background as a VPN to block network access to certain apps, for example I use it to block every network connection by Gboard)
• NewPipe
• Simple File Manager
• Tasks.org

On Windows:

• Bitwarden, password manager (FOSS, but paid account or contribution(s) made - support development!)
• Advanced Renamer, just what it says (FOSS, but paid account or contribution(s) made - support development!)
• FreeFileSync, terrific file sync app (FOSS, but paid account or contribution(s) made - support development!)
• VLC, media player
• WizTree, folder comparison (FOSS, but paid account or contribution(s) made - support development!)
• Notepad ++, use it everyday (FOSS, but paid account or contribution(s) made - support development!)
• Everything, ditch Windows Search!
• Plex, Emby, Jellyfin for media streaming (Jellyfin is FOSS, Plex can be free, Emby??? - have Plex and Emby Lifetime accounts)
• caddy server, easy to set up and use

Android:

• FairEmail - best email client around (FOSS, but paid account or contribution(s) made - support development!)
• nzb360 - monitor all your arr apps (FOSS, but paid account or contribution(s) made - support development!)
• Tautulli - Plex stats on steroids (Android, plus also on Windows)
• Nova, great launcher (FOSS, but paid account or contribution(s) made - support development!)
• Standard Notes FOSS, but paid account or contribution(s) made - support development!)
• Authy
• Boost, soon to be gone thanks to reddit CEO
• Sports Alert (FOSS, but paid account or contribution(s) made - support development!)

Probably missed some, but the above are essential to my everyday use.

Almost everything what I use is already listed here (Termux, NewPipe, Joplin, etc), so, here's a few small apps that no one has mentioned yet:

ViMusic - a tiny accountless app to stream music from YouTube music.

HTTP Shortcuts - an app that allows you to create home screen shortcuts that execute arbitrary http requests, it supports JavaScript, so, you can write even something pretty complicated.

• Aegis Authenticator (2FA)
• AntennaPod (podcasts)
• F-Droid (app store)
• FitoTrack (fitness)
• Forecastie (weather)
• Fritter (for twitter, no login or posting)
• Jerboa (lemmy)
• KeePassDX (password manager)
• Linphone (for my voip numbers)
• Loyalty Card Keychain (scan my reward cards into one place)
• Material Files (file/network browser)
• NewPipe (ad-free youtube)
• OsmAnd~ (GPS/maps/directions)
• ProtonVPN
• Syncthing (syncs phone folders with desktop folders, i use for keepass and photos)

Aegis, Bitwarden, OrganicMaps, VLC, Jellyfin, Signal, Infinity, Jerboa, StandardNotes, Newpipe, Fritter and Tutanota

This is going to be a long list.

VLC, for playing videos and other media.

Auxio, for playing music and organizing playlists and such.

ConnectBot, for SSH.

Shizuku, for apps that support it.

RootlessJamesDSP, for audio stuff. Powered by Shizuku.

aShell, for stuff that requires root permission.

Aurora Store, for the few apps I need from the playstore.

KISS Launcher.

Droidify, for everything I need from F-Droid. Also powered by Shizuku.

Feeder, for RSS feeds.

FTPClient, for SFTP connections.

LibreTorrent, for torrenting and such.

Mull, for web browsing.

RedReader - a fantastic Reddit app, that hopefully will support Lemmy in the future.

My Expenses: pretty much the best expense tracking and budgeting android application I've had the pleasure of finding, It has some paid plans to enable cloud hosting, a local web server, among others, but the free one was more than enough to me for years.

Newpipe for YouTube.

Little File Explorer - It just works.

Material Files

Seeker - Music Downloader

CaPod - Airpod Status Notification

Otraku - Anilist client

Personal DNS Filter - adblock

Unchained - Real Debrid client

Acode - Text Editor

Jerboa is pretty cool too

Right now, Infinity for Reddit, but with the Reddit API debacle, I guess it's either Jerboa for Lemmy or Firefox Focus.

Favorite would probably be either Material Files file explorer or K9 or Proton Mail for email.

The one I am using and not already mentioned :

• qBitController to remote manage qBittorrent

• Transistor a very basic app to listen to radio over internet. Previously I was using RadioDroid which is more advanced but for what I do a simple app is largely enough and better

Probably Open Note Scanner, OsmAnd and Password Store.

I have lawnchair and the Papirus icons and I also have some of the Simple App suite to replace the propietary file manager, camera, etc.

I also have a reminders app called Habits, as well as Revanced, Infinity for Reddit (RIP), and Jerboa.

And for games I have Lichess, Mindustry and Shattered Pixel Dungeon

AdAway for Android via fDroid

On my Android tablet, my most used app has got to be either Mull (web browser, based on Firefox), NewPipe (YouTube client), or Tusky (Mastodon client).

My favourite app, however, is probably UntrackMe.

Android

• Waistline calorie counter
• Verifit workout diary

They're both pretty basic but honestly upon switching I realized how many superfluous features I didn't use in my old apps.

I recently switched to KISS launcher; it's a bit unorthodox but I like it a lot now that I'm used to it. AntennaPod is good for podcasting too

OsmAnd for maps and navigation

Antennapod for podcasts.

• Privacy Browser
• Megalodon
• FairEmail
• Etar with DAVx5 and ICSx5
• Markor
• Total Commander

Honestly, too many to choose from. My phone is 99% FOSS right down to the icons.

There's so many:

• Termux: terminal
• Tailscale: easily allows for setting up a mesh VPN network, completely unbothered by firewals and NAT. Sometimes I fix stuff on my homeserver from my phone with Termux.
• Tachiyomi: great manga reader, I only hope that sync gets officialy built in (I'm already using SyncYomi).
• Revolution IRC: IRC client.
• Nextcloud: backs up photos on my homeserver instead of Google Photos. Sadly uses a lot of battery, probably because I have around 50K images to scan.
• Jellyfin: streams shows and films from my homeserver.
• Fedilab: mastodon client.
• FairEmail: privacy friendly email app.

Antennapod, KDE Connect, ... way too many to name. F Droid (in my case Neo Store) is a great place to search. If I search for a certain use case, I check out this Github Repo that lists very good FOSS apps

Firefox - browser Signal - messaging app