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