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SMS Backup & Restore? Unless there is an alternative that I'm missing? Play store link
Visual voicemail
Readably
No RSS reader is quite like it.
Synfonium
Best music player out there.
Why is there not an app that tells you which grocery stores have the best prices? I should be able to give it a list and it'll tell me where to buy each item.
FLOSS Shazam? I really love discovering music when I travel, but I see no open source version of it.
Uber? What do you use for rides?
Xplore file browser
It's trivial to replace the independent pieces of xplore, but it has so many features in one app that I just can't let it go. It's got dual pane file browsing, disk usage chart, smb, ftp, and many other cloud storage connections. It also handles many types of compression.
It's become my main offline music player as well, because it has the simple ability to shuffle a folder of music, which is all I really need.
It can also view installed apps, export them to apk, and view and modify appdata (as non root!).
I don't have any suggestions. I can't think of any proprietary app good enough that I'd give up control of my computing for. However, consider objective requirements rather than subjective terms like good. What do you use the proprietary app for, why are existing free alternatives not sufficient, and can a free app be made that satisfies those requirements?
This is not an answer to your question, but I would love if somebody would make InputStick software for platforms other than android if possible
I'd be happy if Voiply would just work without GMS and could be downloaded from F-droid.