If you have the apps from F-Droid, there is no need to rush, I think. The F-Droid-apps are without adds and offline. They no longer receive updates, but they are not apps that need constant updates.

Yes! Ghost Commander is open source and it’s able to transfer via sftp

My answers from Firefish unfortunately do not arrive here on Lemmy. It would be great if it basically worked from Firefish, now. If it is instance-dependent, I would perhaps change the instance, because Firefish offers many advantages compared to Mastodon.

Maybe this one? https://apt.izzysoft.de/fdroid/index/apk/dev.bartuzen.qbitcontroller

Take a look at Cryptpad Forms or FramaForms.

“Magic Earth” is unfortunately not FOSS, but it is “one of the few navigation apps that do without advertising and tracking.” (mobilsicher.de). It includes also “Crowd Sourced Traffic”.

“Rain” is also available at Izzy’s: https://android.izzysoft.de/repo/apk/com.yoshi.rain

FairEmail is also recommended by many. It has even more functions, but is therefore also a bit more complicated.

for Android: k9-Mail

On this basis, there is also another video that shows the scenes from 1902 and 2015 in parallel: Wuppertal Schwebebahn 1902 & 2015 side by side video 🚟 🚟

Here you can search for Commnunitys across (almost) all instances: https://lemmyverse.net/communities This exists: https://lemmy.ml/c/epilepsy But it still seems to look inactive

You may use this tool to search communities: https://lemmyverse.net/communities