Edit: Added ente Photos, Mullvad, IVPN, Tutanota, Standard Notes, Notesnook, and Berty
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I have neck issues and emulating my phone on screen is a must! I cant get enough of 'guiscrcpy' Open source Android screen mirroring! Multiple phone support, works perfect! https://guiscrcpy.srev.in/
Just mentioning the tools I had not seen on other posts:
Darktable is a great photo editor (similar to Lightroom).
If we're talking about mobile apps only then ntfy, Fluffy Chat, KDE Connect, Nextcloud, Tuta, Protonmail, Session, Conversations, Organic Maps, Fedilab, Mull, DAVx and KeePassDX.
For iOS:
Fully FOSS:
FOSS, but with a paid tier:
Paid Only, but Open Source:
Privacy Friendly, but not FOSS apps:
Edit: Added ente Photos, Mullvad, IVPN, Tutanota, Standard Notes, Notesnook, and Berty
Starred this reply, thank you!