because i use a "dumb phone" (non-touch android flip phone, Sonim XP3 Plus 5G (X320)) my apps reflect that need a bit more.

• TT9 invaluable app for T9 android phones, it works so so much better than the stock keyboard.
• SimpleEmail this was the only email client that i could find that could work without a touchscreen. So far I've been reeeaally happy with it--it's so nice to have a solid email client again.
• DSub2000 subsonic/navidrome client that "mostly" works without a touchscreen. it's not perfect, but for my use case it is usable when i don't want to pull out my MP3 player.
• Localsend OS agnostic "air drop", must have
• KDE connect Works really well on the Sonim for SMS, notifications etc (I had more issues previously when running older versions of Android on "dumb" devices)
• DAVx5 Contact and Calendar sync, works so well with fastmail (or self hosted options); this is a life saver for me so that i can use the built in contacts/calendar for my non-touch device.
• Delta Chat works surprisingly without touch. it's hard to get people to switch off text or signal. But because my phone doesn't support RCS, and signal is pretty mid (but still usable) without touch, delta chat has worked good for me.
• Privacy Friendly QR Scanner works perfectly without a touchscreen, and has been invaluable on devices that do not come with a touch screen.

These are a couple apps that are not on fdroid, but work really well on my device if anyone is curious:

• BIG Launcher Expensive AF, but I was able to purchase the launcher on my pixel (that runs grapheneOS), then send them an email saying it doesn't work on my Sonim X320 because it doesn't have google play services--they sent me an APK of the full version that does not need google play services. This is one of the few launchers that works on non-touch devices, and it's actually really good. The default launcher on the Sonim bugs out and does not show apps that are not pre-installed.
• PodLP is a podcast app that is specifically made with non-touch/feature phones in mind. The developer did some AI assisted work to reverse engineer the API's for the softkeys on phones like the sonim. While I don't like AI, and try to use software that is free of slop--this is really cool work that I haven't seen in any other applications. The developer just recently put out the apk on android it seems like maybe it will come to f-droid or something.
• MATVT Is the virtual mouse that I am using to get around not having a touch screen when needed. But TBH the scrolling is jank and only works on some apps... If anyone has another options or tips, I'd love to try anything else at this point.