https://rclone.org/ I use that to encrypt my files and send them to any WebDAV server, proton drive and others.

https://f-droid.org/en/packages/io.github.x0b.rcx/

yes !

There’s already this Megathread https://lemmy.ml/post/12432375

In Accessibility option you can enable it

DekuSMS adds encryption if your contact have it, and you can still use normal SMS if your contact doesn’t have the app installed.

https://f-droid.org/packages/com.afkanerd.deku/

I use their services since 2018 ! I can recommend !