@IzzyOnDroid Thank you! The source is not public though, and also uses Android Wear. However I am thinking about doing a rewrite with only open source components, if possible. I am not sure though if a watchface can be done without using Android Wear.
@shred @IzzyOnDroid
Meanwhile, you can set up your own #fdroid repo and put your "proprietary" #apks in.
If the users like, they then can add your repo to their app store app.
I also run a small fdroid server where I also publish my apps.