Maybe Niagara Launcher, though I'm quite happy to pay the dev a bit of money (not required for most stuff actually, I only login on my phone)

Until recently I'd have said Symfonium for music playback from Jellyfin, but the Finamp beta gave me an OSS alternative.

Ideally banking apps, booking.com and TripAdvisor all had FOSS alternatives, but that's not realistic.

Some apps that I don't understand why no OSS exists:

• Teleprompter app that allows you to read a scrolling script while recording video

• basic photo editor to crop, rotate, color correct, add text

• basic video editor to crop, clip, and combine video

• visual voicemail

And just for fun, here are some OSS apps that are better than any non-free alternative: SD Maid, Firefox/Fennec, Aurora Store (OSS front-end for a very proprietary Google store), RTranslator, Syncthing, OSS Document Scanner.

All the Life360 alternatives are objectively worse and harder to use.

Fatmap. It was freemium, but now it's moving into Strava, who knows how much of it they'll hide behind subscriptions.

There's so many great FOSS maps, but I haven't seen any that give you the 3D view that Fatmap does. It's essentially Google Earth with overlays of routes for various activities.

Universal Copy and Network Signal Guru. former is used to copy on text which usually unable to copy. latter is used to modify some modem setting.