Free and Open Source Software

Newpipe for YouTube.

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

• 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 felt they actually deserved it, unlike lastpass
• Mull, A Firefox fork with privacy enhancements, 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.

Material Files

Seeker - Music Downloader

CaPod - Airpod Status Notification

Otraku - Anilist client

Personal DNS Filter - adblock

Unchained - Real Debrid client

Acode - Text Editor

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.

My most useful is probably ntfy & my matrix client, Element. I self-host ntfy & a matrix dendrite server with some bridges. I am able to receive notifications from all of my chats without Google services installed, as well as notifications from Tusky thanks to Element and Tusky's support for UnifiedPush.

OONI Probe

Great for detecting censorship on public WiFi

Nextcloud Notes for notes

Antennapod for podcasts.

Phonograph - Music player
Newpipe - Youtube frontend
Husky - Pleroma client
KDE Connect - Desktop connectivity
Tachiyomi - Manga reader
Simon Tatham's Puzzles - Pen and paper-style logic puzzle collection

OsmAnd for maps and navigation

Revanced for YouTube, Audacity, KDENlive, VLC, OBS studio, and the *ARR suite of applications.

Edit: I did not see that you said Android. Revanced it is then.

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

Firefox - browser Signal - messaging 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

Standard Notes, if you're ok with just text notes it works good

Kubernetes / OKD. Since, via OpenShift, it pays my bills.
screen. Rather helpful for long running stuff if I drop VPN form work.

• Feeder: a pretty rss reader
• Thumbkey: A keybord with a vastly different layout designed for ergonomy. I'm realy happy about this one because the only atlernative was closed source.
• syncthings-fork to backup my files
• SD contacts on fdroid to export my contacts on change in a folder for syncthings to backup. ( I changed the code of this one to use only one file instead of several ones)
• kde-connect: allows sharing notifications, files, and much more between your phone and pc
• libretube: a youtube piped client

• 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.

I like Voice for my audiobooks. Also Newpipe and of course Signal :).

Diskusage

Analyser and display of phone storage space. Extremely useful for me as I tend to take a lot of stuff with me everywhere.

Many of my favourite apps are already listed here, so I won't repeat them

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

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~~

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.

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.