>>madars+(OP)
Happy long term user, great project. Here is a list of Open Source Apps, I use to replace Google stuff:
Aurora Store - Anonymized frontend for Playstore
F-Droid - Open Source App Store
Obtainium - App Store for other sources (e.g. github)
Organic Maps - Open Source navigation (not as good as proprietary ones though)
SherpaTTS - Text to speech for Organic Maps
PDF Doc Scanner - Little Trickster, Open Source document scanner
Binary Eye - Barcode reader
K9 Mail / FairMail - Mail client
LocalSend - Cross Platform File Transfer
Syncthing Fork - Catfriend1 Syncthing fork to sync files
VLC Media Player - media player
KOReader - ebook reader
Voice - Paul Woitaschek, local audiobook player
AudioBookShelf - Remote audiobook player
Immich - image backup
Fossify File Manager - file manager
Substreamer / DSub - Audio streamer for navidrome self hosted server
OpenCamera - Open Source camera app
I wish I had this list from the start... Hope it helps someone :-)