WillyWonksters
For YouTube frontends: On the Linux desktop, there is FreeTube, on IOS there is yattee (IIRC), then there are web based front ends from invideous.
Louis Rossman mentioned the other day that they are in the process of creating an app that will allow you to follow your chosen creators across multiple services, so that you can continue even if their primary platform removes them.
If you’re looking for YouTube alternatives, check out Peertube, Odyssey, and Nebula (I haven’t looked at Peertube or Odyssey in a while, so I can’t comment on how they are doing).
Address based search works, but the data is largely lacking.
You can help by adding building numbers from within Organ Maps (tap a building and, then “edit place”).
The underlying OSM dataset supports building number interpolation, so even a few accurate entries could be very helpful.
Open maps will improve greatly in the near future. The Overture Maps Foundation is working on an open mapping dataset to rival Google.
PewPew live and PewPew 2
Lichess - rather than chess.com
Rustdesk - remote desktop software
Syncthing - rather than Dropbox
KDE Connect - phone/computer integration (notifications, media control, mouse and keyboard, file sharing, presentation remote, clipboard sharing, etc)
Aves gallery,
Organic maps
PlayBook - audiobook player
Bitwarden - password manager,
Droid-ify - F-droid client
Element - matrix client (potentiall alternative to discord)
GrapheneOS is also great.