Is there any proprietary Android app for which you wish there would be an open-source alternative?
Basically, what the title says. Do you use any app, that is proprietary, but either has no OSS alternatives or they're all not good enough? If there is an alternative, what keeps you from switching?
Smart Audiobook Player: None of the apps I tried had all the features in one, like reading my complex audiobooks folder structure and auto grouping the books based on that. Timer to pause audiobook that is automatically reset by moving the phone.
Maps: No foss solutions work better where I live than GMaps
YTMusic: So this is a tough one to beat because of the nature of the platform itself.
Notes: I am looking for a P2P syncable note app that can also have a web interface or atleast a Linux version of the App. Allows drawing your notes on an android phone or tablet using stylus, and other usual features. Can also use cloud storage as a backup or sync source. I know this one is a really tall order.
There's a lot of FOSS music apps that just use YTMusic, like ViMusic or the ones other people mentioned in their replies. For maps, I use Organic Maps, the only thing I feel like is missing from it is traffic jams but I think you can see why that would be hard to add. It does have features that Google Maps doesn't have tho.