Free and Open Source Software

• Quillpad (offline notes)
• MuPDF mini (Great simple PDF reader)
• Unit Converter Ultimate (lots of various conversions)
• Retro Music (fdroid repo for pro version, best music player hands down)
• OSMAnd (Great for fancy mapping features)
• Mull (hardened Firefox with the quickest updates of all Firefox based browsers)
• AntennaPod (best podcast app)
• Obtanium (install apps easily from sources such as Github)
• Droid-ify (better fdroid)

• LineageOS: my Android ROM of choice

• LineageOS for MicroG: the ROM on my second phone where I quarantine my use of apps that refuse to work without Google services (mostly stuff I need for business travel e.g. Amtrak, Google Maps)

• Aurora Store: allows installation of most Play Store apps without login. I mainly use this on the MicroG phone, but it's also needed to get the ProtonMail and ProtonCalendar apps (only ProtonVPN is on F-Droid)

• TrackerControl: allows fine tuned domain blocking on a per-app basis. Often allows you to block just ads and trackers but still be able to use an app or at least many of its features.

• Arcticons: monochrome line art icons (because I hate fun and want my GUIs to look like a terminal)

• AsteroidOS Sync: WearOS replacement. AsteroidOS still has a long way to go, but I doubt WearOS would play nicely with LineageOS and I don't want all the tracking anyway.

• Bubble: bubble level by woheller69 (a true F-Droid GOAT)

• FlorisBoard: afaik, only FOSS gesture typing Android keyboard (besides AnySoft, which doesn't seem to work consistently)

• GMaps WV: fairly locked-down web viewer for Google Maps (sadly OSM just doesn't have a usably complete business directory where I live)

• Lawnchair: launcher with all the features I want except being up to date on F-Droid

• Librera: the PDF reader on F-Droid that I hate the least. (Anyone got any better recommendations?)

• NewPipe: ad-free Youtube player with locally stored subscriptions and playlists. An IzzyOnDroid fork with SponsorBlock is also available.

• QKSMS: my SMS app of choice

• Signal: because I can't convince my friends to switch to Briar

• SpoTube: pirate ad-free Spotify that works by looking up tracks on Youtube. Is therefore limited by what's available on YT and sometimes plays wrong tracks, but you can't beat the price :] Even interfaces with a Spotify account to play and edit playlists.

• Standard Notes: E2E encrypted cloud-synced notes. Also accessible by web browser, which has saved my ass a few times while phoneless

• Weather: by BeoCode on F-Droid

• VLC: everyone's favorite traffic cone boi

• F-Droid for FOSS apps

• Aurora for Google Playstore apps

• OSMAnd for navigation

• Oeffi for public transport

• many Simple Mobile Tools apps

• K-9 Mail

• Tor browser

• Shelter for isolating apps

• Tusky for Mastodon

• Jerboa for Lemmy

• Nunti for RSS feeds

• Molly for Signal

• Telegram FOSS

• Aegis for 2FA

• QickDic (dictionary)

• TinyWeather

• Threema Libre (not free)

Syncthing is the one, I could probably replace any one but this one.

• Fedilab for Mastodon (an alternative to Tusky)
• Jerboa for Lemmy
• LibreTube for usable YouTube without an account
• FluffyChat for Matrix (an alternative to Element)
• FairEmail for mails
• Molly for Signal (pretty much the same as the original app)
• Forkgram for Telegram (also pretty much the same as the original open source version)
• Aurora for PlayStore apps
• F-Droid
• Fennec for browsing (the opener version of Firefox)
• Aegis for 2FA (an alternative to Google Authenticator)
• KeePassDX for passwords (an alternative to Keepass2Android)
• OpenKeychain for PGP Keys
• Orbot for connecting to Tor and running a Snowflake proxy
• RethinkDNS as DNS with blocklists, firewall and routing to Orbot via Proxy for all TCP connections
• Tutanota as synchronized calendar
• Osmand~ for navigation (an alternative to Google Maps)
• Transportr for public transport (an alternative to DB Navigator in Germany)
• In general the "Simple ..." apps on F-Droid are also nice

Firefox, LibreTube, Kaiteki

Bitwarden

KDE Connect means that I can ping my phone that's usually presumably somewhere behind my bed or on a counter somewhere, without having to sheepishly walk to the nearest person and ask "can you call my phone I lost it :c"

Ankidroid— Create, share, borrow and study with flash cards

Firefox— Web browser

Rethink Firewall— Best firewall for android

Infinity— Gonna miss this one (Reddit client)

Libretube— Modern Youtube client using Piped

Obtainium—Keeps track of all my foss apps from their git repositories + them

Gnu IMP— Desktop photo editor

Aurora Store— Download apps from the play store

Bitwarden, Signal, Firefox, Sumatra PDF, Standard Notes, andOTP, and VLC Media Player

• keepassdx - password management
• aegis - offline 2-fa
• obtainium - download apk from github, gitlab, f-droid, and many more sources
• k-9 mail - best email client

Some from the ones I use:

• F-Droid
• Fennec (firefox variant that supports custom addon collections)
• K-9 Mail
• Termux (terminal + Linux environment)
• Jerboa for Lemmy
• Wikipedia