For the past month, I have been working on Sly, a cross-platform photo editor with a focus on usability. I have recently released it on Linux. I am now seeking testers for the Android version and it has been suggested to me to announce it here ^^
At the moment, there are key features missing for professional work, namely support for RAW images outside of Apple platforms (since those have native decoders), editing in color spaces wider than sRGB, and batch processing. For quick edits however, it should hopefully work quite well. These features are also planned for later versions.
The app was made for a similar workflow to eg. the modern Adobe Lightroom, with a simple and direct UI without distractions.
If you would like to be invited to the closed test on Google Play, you can message me with the email address for your Google account. (This is necessary to get invited, I wish it wasn’t!)