I can't find an equivalent replacement for Musicolet. There are plenty of open source music players out there for Android that just don't have the little features that Musicolet does. Such as multiple queues, lyric editing, metadata editing, format conversions, stop after the track finishes, easily reorder songs and clear queues, etc.

KineStop - After Apple announcef Motion Cues, I went looking on Android because I cannot use my devices in a moving vehicle. KineStop is all I found. I went ahead and bought it because it helps (doesn't completely get rid of motion sickness). I would gladly switch to an open source alternative if one were available.

The Transit app, used for bus/train route info and buying tickets. I imagine the ticket buying part would be difficult to OS, but I just want the live transit routing info. A few apps exist for other cities, but not mine. Worst part is Transit relies on Google Maps.

Make an Android app for Redlib please :)

A delivery tracking app would be great, ideally with Widgets and Material You. On iOS I used to use Deliveries or ParcelTrack, but after switching to Android and primarily using open source software, I couldn't find a good alternative.

I don't use it much since I've already got it active on the apps I wanted it for, but on Samsung's Galaxy Store there is an app I've never found an alternative to anywhere from my limited searching: Sound Assistant.

On desktop/laptop, turning off individual app/program sounds is super easy, but this is literally the only app I've ever seen that allows you to turn off the sound for individual apps on android. Don't know if other versions of android from other brands or android 14 has that feature natively, but it's a feature I wish was native to all versions of android regardless of which large brand has made their own alterations to android.

A minor problem, though, as I assume most people probably don't give a rats ass about this.

WhatsApp

I was going to write "a decent comic reader", but I've recently discovered Kotatsu and it has literally changed my life.

"Pixels" mood tracker. I love it but I also love self-hosting all my services.

Komoot and strava... General route planning and teavkinv software..

Fitbod, a fitness app that monitored my progress and health data and auto generated appropriate workouts taking muscle group fatigue into consideration

I want to crop screenshots easily :(

There is an IOS app for hot air balloon pilots called "Hot Air". There is a similar app for Android that... Leaves much to be desired.

There's several functions that are needed. First, we need a map. We need to be able to enter waypoints and/or polygons charting landing zones, prohibited zones, targets, etc. we need an easy way to select targets, and our bearing and distance to those targets.

For planning purposes, we need a bearing line that we can place and move on that map. We need to be able to easily drag and drop each end of the line, and get the bearing and distance between the endpoints.

Next, we need track recording. It should record a ground track during flight, preferably with altitude information, and notes about the flight.

Next, a wind map. The wind speed and direction varies considerably by altitude. It needs to record direction and speed as we climb and descend, telling us what altitude has winds favorable for our current target.

Bonus points if we can prepopulate that wind map with data from a "pibal" (pilot balloon; a simple latex party balloon released and tracked with compass and stopwatch before a flight)

Next, coordination with other pilots and ground crews. 3D location sharing between participants; wind map data shared between pilots.

Something that comes up a lot but probably can't be made open source is a wallet app. But if we ignore the payments part, Google wallet has some really nice features when dealing with plane tickets which I'd love to see in a standalone open source app.

I don't have any idea of how conplicated it would be, but a phone app would be a nice option. The stock dialer that comes with FOSS ROMs is OK functionally, but visually looks like it was from 2010. Plus it's not available through F-droid or other open source app store. Koler is the only serious dialer alternative I've seen, and while it looks nice it has always been super buggy.

If you're interested in something that doesn't even exist, and should be more-or-less straightforward:

Music/podcast app that will accept VST plugins (there are many FOSS ones, as well as non-FOSS ones) so that we can compress/limit the sound range on podcasts while in the car. Or even a built-in compressor/limiter that's based on FOSS compressors.

I was listening to a hysterical podcast episode between three people, but one of mics was way louder than the other two. I had to take it into Pro Tools and fix it myself before listening to it.

There are apps that allow EQ, but none that do actual compression, from what I can tell.

Would like to get an effective metadata eraser, this one is pretty good https://f-droid.org/packages/com.jarsilio.android.scrambledeggsif/ but cannot saved to device, that's really awful... If you could get something as strong as this and saved it to device that would be pretty nice

I can't wake up or a similar app.

I would've wanted an alarm clock app with 'tasks' you need to do before turning it off.

A lightweight office suit

Mixplorer ?

Visual voicemail